<?xml version="1.0" encoding="UTF-8"?>
<netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2" location="Not provided because of security concerns.">
  <attribute name="Conventions" value="CF-1.8, ACDD-1.3" />
  <attribute name="featureType" value="timeSeries" />
  <attribute name="title" value="Nitrogen oxides at Longmont Union Reservoir" />
  <attribute name="summary" value="Nitrogen oxides at Longmont Union Reservoir. These measurements are gathered as a part of the following projects Independent and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: ['NOx in air (mole_fraction_of_nox_in_air)', 'NOx in air (mass_concentration_of_nox_expressed_as_nitrogen_in_air)', 'nitrogen_dioxide in air (mole_fraction_of_nitrogen_dioxide_in_air)', 'nitrogen_dioxide in air (mass_concentration_of_nitrogen_dioxide_expressed_as_nitrogen_in_air)', 'nitrogen_monoxide in air (mole_fraction_of_nitrogen_monoxide_in_air)', 'nitrogen_monoxide in air (mass_concentration_of_nitrogen_monoxide_expressed_as_nitrogen_in_air)']" />
  <attribute name="keywords" value="&quot;Longmont Union Reservoir&quot; US0107R NOx nitrogen_dioxide nitrogen_monoxide air Independent mole_fraction_of_nox_in_air mass_concentration_of_nox_expressed_as_nitrogen_in_air mole_fraction_of_nitrogen_dioxide_in_air mass_concentration_of_nitrogen_dioxide_expressed_as_nitrogen_in_air mole_fraction_of_nitrogen_monoxide_in_air mass_concentration_of_nitrogen_monoxide_expressed_as_nitrogen_in_air" />
  <attribute name="id" value="5DMV-SCDC.nc" />
  <attribute name="naming_authority" value="EBAS" />
  <attribute name="project" value="Independent" />
  <attribute name="acknowledgement" value="" />
  <attribute name="doi" value="https://doi.org/10.48597/5DMV-SCDC" />
  <attribute name="license" value="https://creativecommons.org/licenses/by/4.0/" />
  <attribute name="citation" value="Helmig, D., Independent, 2026, Nitrogen oxides at Longmont Union Reservoir, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/5DMV-SCDC" />
  <attribute name="source" value="surface observation" />
  <attribute name="institution" value="US17L &quot;Boulder Atmosphere Innovation Research LLC&quot; &quot;Boulder AIR&quot; &quot;2820 Lafayette Drive&quot; 80305 Boulder USA" />
  <attribute name="processing_level" value="processing_level_test" />
  <attribute name="date_created" value="2026-03-12T10:42:03.448722Z" />
  <attribute name="date_metadata_modified" value="2026-03-12T10:42:03Z" />
  <attribute name="creator_name" value="Detlev Helmig" />
  <attribute name="creator_type" value="person" />
  <attribute name="creator_email" value="dh.bouldair@gmail.com" />
  <attribute name="creator_institution" value="&quot;Boulder Atmosphere Innovation Research LLC, Boulder AIR&quot;" />
  <attribute name="contributor_name" value="Detlev Helmig" />
  <attribute name="contributor_role" value="data submitter" />
  <attribute name="publisher_type" value="institution" />
  <attribute name="publisher_name" value="NILU - Norwegian Institute for Air Research, ATMOS, EBAS" />
  <attribute name="publisher_institution" value="NILU - Norwegian Institute for Air Research, ATMOS, EBAS" />
  <attribute name="publisher_email" value="ebas@nilu.no" />
  <attribute name="publisher_url" value="https://www.nilu.no/" />
  <attribute name="geospatial_bounds" value="POINT Z (-105.0477 40.1762 1514)" />
  <attribute name="geospatial_lat_min" type="double" value="40.1762" />
  <attribute name="geospatial_lat_max" type="double" value="40.1762" />
  <attribute name="geospatial_lon_min" type="double" value="-105.0477" />
  <attribute name="geospatial_lon_max" type="double" value="-105.0477" />
  <attribute name="geospatial_vertical_min" type="double" value="1514.0" />
  <attribute name="geospatial_vertical_max" type="double" value="1514.0" />
  <attribute name="geospatial_vertical_positive" value="up" />
  <attribute name="geospatial_bounds_crs" value="EPSG:4979" />
  <attribute name="time_coverage_start" value="2019-12-17T23:00:00Z" />
  <attribute name="time_coverage_end" value="2024-12-31T23:00:00Z" />
  <attribute name="time_coverage_duration" value="P0005-00-14T00:00:00" />
  <attribute name="time_coverage_resolution" value="P0000-00-00T01:00:00" />
  <attribute name="timezone" value="UTC" />
  <attribute name="ebas_data_definition" value="EBAS_1.1" />
  <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
  <attribute name="ebas_citation" value="Helmig, D., Independent, 2026, Nitrogen oxides at Longmont Union Reservoir, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/5DMV-SCDC" />
  <attribute name="ebas_set_type_code" value="TI" />
  <attribute name="ebas_timezone" value="UTC" />
  <attribute name="ebas_file_name" value="5DMV-SCDC.nc" />
  <attribute name="ebas_represents_doi" value="https://doi.org/10.48597/5DMV-SCDC" />
  <attribute name="ebas_contains_doi" value="https://doi.org/10.48597/5DMV-SCDC" />
  <attribute name="ebas_file_creation" value="2026-05-22T03:10:50.840984Z" />
  <attribute name="ebas_export_state" value="2026-03-12T10:42:03.448722Z" />
  <attribute name="ebas_export_filter" value="exclude-900,exclude-invalid" />
  <attribute name="ebas_startdate" value="2019-12-17T23:00:00.000000Z" />
  <attribute name="ebas_revision_date" value="2026-03-12T10:42:03.448722Z" />
  <attribute name="ebas_version" value="1" />
  <attribute name="ebas_version_description" value="initial revision,manually inspected" />
  <attribute name="ebas_data_level" value="2" />
  <attribute name="ebas_period_code" value="5y" />
  <attribute name="ebas_resolution_code" value="1h" />
  <attribute name="ebas_sample_duration" value="1h" />
  <attribute name="ebas_orig_time_res" value="1mn" />
  <attribute name="ebas_station_code" value="US0107R" />
  <attribute name="ebas_platform_code" value="US0107S" />
  <attribute name="ebas_station_name" value="Longmont Union Reservoir" />
  <attribute name="ebas_station_state_province" value="CO" />
  <attribute name="ebas_station_land_use" value="Agricultural" />
  <attribute name="ebas_station_setting" value="Suburban" />
  <attribute name="ebas_station_latitude" type="double" value="40.1762" />
  <attribute name="ebas_station_longitude" type="double" value="-105.0477" />
  <attribute name="ebas_station_altitude" value="1514.0 m" />
  <attribute name="ebas_measurement_height" value="8.5 m" />
  <attribute name="ebas_regime" value="IMG" />
  <attribute name="ebas_matrix" value="air" />
  <attribute name="ebas_laboratory_code" value="US17L" />
  <attribute name="ebas_instrument_type" value="chemiluminescence_photolytic" />
  <attribute name="ebas_instrument_name" value="LUR_NOx" />
  <attribute name="ebas_instrument_manufacturer" value="Teledyne" />
  <attribute name="ebas_instrument_model" value="T200UP" />
  <attribute name="ebas_instrument_serial_number" value="149" />
  <attribute name="ebas_method_ref" value="US17L_Teledyne" />
  <attribute name="ebas_standard_method" value="SOP=ACTRIS_NOxy_2014" />
  <attribute name="ebas_inlet_type" value="Hat or hood" />
  <attribute name="ebas_inlet_description" value="Downward facing with hood" />
  <attribute name="ebas_ozone_correction" value="Not corrected for reaction with O3 in the inlet" />
  <attribute name="ebas_water_vapor_correction" value="Not corrected for water vapor quenching in CLD" />
  <attribute name="ebas_humidity_temperaure_control" value="None" />
  <attribute name="ebas_humidity_temperaure_control_description" value="passive, sample heated from atmospheric to lab temperature" />
  <attribute name="ebas_detection_limit_expl" value="Determined by instrument counting statistics" />
  <attribute name="ebas_zero_negative_values_code" value="Zero/negative impossible" />
  <attribute name="ebas_zero_negative_values" value="Values (1-minute) below detection limit reported as half the detection limit" />
  <attribute name="ebas_qa1_measure_id" value="CDPHE APCD Nitrogen Dioxide Analyzer Audit" />
  <attribute name="ebas_qa1_date" value="2021-10-08T00:00:00Z" />
  <attribute name="ebas_qa1_outcome" value="pass" />
  <attribute name="ebas_qa1_document_url" value="https://www.bouldair.com/qc_reports/Union_Reservoir_Longmont_NOx_Analyzer_Audit_10-08-21.pdf" />
  <attribute name="ebas_organization" value="US17L, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, USA" />
  <attribute name="ebas_framework_acronym" value="Independent" />
  <attribute name="ebas_framework_name" value="Independent data made available without official affiliation to another existing EBAS project/framework" />
  <attribute name="ebas_framework_description" value="&quot;Project established to allow reporting of data which do not have an affiliation to frameworks in EBAS. Users of &quot;&quot;Independent&quot;&quot; data should investigate the associated metadata and take contact with data originators regarding matters associated to data use&quot;" />
  <attribute name="ebas_framework_contact_name" value="Kjetil Tørseth" />
  <attribute name="ebas_framework_contact_email" value="kt@nilu.no" />
  <attribute name="ebas_originator" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
  <attribute name="ebas_submitter" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
  <attribute name="ebas_acknowledgement" value="Data used in this &lt;study/report/figure/etc.&gt; were accessed from EBAS (https://ebas.nilu.no) hosted by NILU. Specifically, the use included data affiliated with the framework: Independent. The monitoring program was funded and the data were made publicly available by the City of Longmont, Colorado, USA." />
  <attribute name="_NCProperties" value="version=2,netcdf=4.9.3,hdf5=1.14.6" />
  <attribute name="Metadata_Conventions" value="Unidata Dataset Discovery v1.0" />
  <attribute name="geospatial_lat_units" value="degrees_north" />
  <attribute name="geospatial_lon_units" value="degrees_east" />
  <attribute name="standard_name_vocabulary" value="CF-1.7, ACDD-1.3" />
  <attribute name="history" value="None" />
  <attribute name="creator_url" value="ebas.nilu.no" />
  <attribute name="_CoordSysBuilder" value="ucar.nc2.internal.dataset.conv.CF1Convention" />
  <dimension name="time" length="43443" />
  <dimension name="tbnds" length="2" />
  <dimension name="metadata_time" length="2" />
  <dimension name="qc_NOx_nmol_per_mol_amean_flags" length="1" />
  <dimension name="qc_NOx_ug_N_per_m3_amean_flags" length="1" />
  <dimension name="qc_NOx_nmol_per_mol_stddev_flags" length="1" />
  <dimension name="qc_NOx_ug_N_per_m3_stddev_flags" length="1" />
  <dimension name="qc_nitrogen_dioxide_nmol_per_mol_amean_flags" length="1" />
  <dimension name="qc_nitrogen_dioxide_ug_N_per_m3_amean_flags" length="1" />
  <dimension name="qc_nitrogen_dioxide_nmol_per_mol_stddev_flags" length="1" />
  <dimension name="qc_nitrogen_dioxide_ug_N_per_m3_stddev_flags" length="1" />
  <dimension name="qc_nitrogen_monoxide_nmol_per_mol_amean_flags" length="1" />
  <dimension name="qc_nitrogen_monoxide_ug_N_per_m3_amean_flags" length="1" />
  <dimension name="qc_nitrogen_monoxide_nmol_per_mol_stddev_flags" length="1" />
  <dimension name="qc_nitrogen_monoxide_ug_N_per_m3_stddev_flags" length="1" />
  <group name="CFMetadata">
    <attribute name="time_coverage_start" value="2019-12-17T23:30:00Z" />
    <attribute name="time_coverage_end" value="2024-12-31T22:30:00Z" />
    <attribute name="time_coverage_units" value="seconds" />
    <attribute name="time_coverage_resolution" value="3661.0" />
    <attribute name="time_coverage_duration" value="P0Y0M1840DT23H0M0.000S" />
  </group>
  <group name="NCISOMetadata">
    <attribute name="metadata_creation" value="2026-06-05" />
    <attribute name="nciso_version" value="2.4.8" />
  </group>
  <variable name="time_bnds" shape="time tbnds" type="double">
    <attribute name="long_name" value="time bounds for measurement" />
  </variable>
  <variable name="metadata_time_bnds" shape="metadata_time tbnds" type="double">
    <attribute name="long_name" value="time bounds for ebas metadata intervals" />
  </variable>
  <variable name="v_NOx_nmol_per_mol_amean" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mole_fraction_of_nox_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="nmol/mol" />
    <attribute name="ancillary_variables" value="qc_NOx_nmol_per_mol_amean meta_NOx_nmol_per_mol_amean" />
    <attribute name="cell_methods" value="time: mean" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2026-03-12T10:42:03.448722Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision,manually inspected" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="1mn" />
    <attribute name="ebas_station_code" value="US0107R" />
    <attribute name="ebas_platform_code" value="US0107S" />
    <attribute name="ebas_station_name" value="Longmont Union Reservoir" />
    <attribute name="ebas_station_state_province" value="CO" />
    <attribute name="ebas_station_land_use" value="Agricultural" />
    <attribute name="ebas_station_setting" value="Suburban" />
    <attribute name="ebas_station_latitude" type="double" value="40.1762" />
    <attribute name="ebas_station_longitude" type="double" value="-105.0477" />
    <attribute name="ebas_station_altitude" value="1514.0 m" />
    <attribute name="ebas_measurement_height" value="8.5 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="NOx" />
    <attribute name="ebas_unit" value="nmol/mol" />
    <attribute name="ebas_matrix" value="air" />
    <attribute name="ebas_laboratory_code" value="US17L" />
    <attribute name="ebas_instrument_type" value="chemiluminescence_photolytic" />
    <attribute name="ebas_instrument_name" value="LUR_NOx" />
    <attribute name="ebas_instrument_manufacturer" value="Teledyne" />
    <attribute name="ebas_instrument_model" value="T200UP" />
    <attribute name="ebas_instrument_serial_number" value="149" />
    <attribute name="ebas_method_ref" value="US17L_Teledyne" />
    <attribute name="ebas_standard_method" value="SOP=ACTRIS_NOxy_2014" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Downward facing with hood" />
    <attribute name="ebas_ozone_correction" value="Not corrected for reaction with O3 in the inlet" />
    <attribute name="ebas_water_vapor_correction" value="Not corrected for water vapor quenching in CLD" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="passive, sample heated from atmospheric to lab temperature" />
    <attribute name="ebas_detection_limit" value="0.071 nmol/mol" />
    <attribute name="ebas_detection_limit_expl" value="Determined by instrument counting statistics" />
    <attribute name="ebas_measurement_uncertainty_expl" value="The greater of 5.3% or 0.1 ppb" />
    <attribute name="ebas_zero_negative_values_code" value="Zero/negative impossible" />
    <attribute name="ebas_zero_negative_values" value="Values (1-minute) below detection limit reported as half the detection limit" />
    <attribute name="ebas_organization" value="US17L, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, USA" />
    <attribute name="ebas_framework_acronym" value="Independent" />
    <attribute name="ebas_framework_name" value="Independent data made available without official affiliation to another existing EBAS project/framework" />
    <attribute name="ebas_framework_description" value="&quot;Project established to allow reporting of data which do not have an affiliation to frameworks in EBAS. Users of &quot;&quot;Independent&quot;&quot; data should investigate the associated metadata and take contact with data originators regarding matters associated to data use&quot;" />
    <attribute name="ebas_framework_contact_name" value="Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_submitter" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_acknowledgement" value="Data used in this &lt;study/report/figure/etc.&gt; were accessed from EBAS (https://ebas.nilu.no) hosted by NILU. Specifically, the use included data affiliated with the framework: Independent. The monitoring program was funded and the data were made publicly available by the City of Longmont, Colorado, USA." />
    <attribute name="ebas_comment" value="Data are provided for informational purposes only without any representations as to accuracy or fitness for a particular purpose. -- Data converted on import into EBAS from 'nmol/mol' to 'ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.624923. Detection limit converted from '0.0707 nmol/mol' to '0.0442 ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.624923. -- Data converted on export from EBAS from 'ug N/m3' at 273.15 K, 1013.25 hPa to 'nmol/mol', conversion factor 1.60020. Detection limit converted from '0.0442 ug N/m3' at 273.15 K, 1013.25 hPa to '0.071 nmol/mol', conversion factor 1.60020." />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/nitrogenoxidesamountfraction" />
    <attribute name="actris_variable_preferred_term" value="nitrogen oxides amount fraction" />
    <attribute name="actris_matrix_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/gasphase" />
    <attribute name="actris_matrix_preferred_term" value="gas phase" />
    <attribute name="actris_timeliness_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/scheduled" />
    <attribute name="actris_timeliness_preferred_term" value="scheduled" />
    <attribute name="actris_instrument_type_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/chemiluminescencedetector-photolyticalconverter" />
    <attribute name="actris_instrument_type_preferred_term" value="chemiluminescence detector, photolytical converter" />
    <attribute name="actris_framework_uri" value="" />
    <attribute name="actris_framework_preferred_term" value="" />
    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
  </variable>
  <variable name="qc_NOx_nmol_per_mol_amean" shape="qc_NOx_nmol_per_mol_amean_flags time" type="int">
    <attribute name="_FillValue" type="int" value="0" />
    <attribute name="standard_name" value="status_flag" />
    <attribute name="missing_value" type="int" value="0" />
    <attribute name="units" value="1" />
  </variable>
  <variable name="meta_NOx_nmol_per_mol_amean" shape="metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="v_NOx_ug_N_per_m3_amean" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mass_concentration_of_nox_expressed_as_nitrogen_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="ug/m3" />
    <attribute name="ancillary_variables" value="qc_NOx_ug_N_per_m3_amean meta_NOx_ug_N_per_m3_amean" />
    <attribute name="cell_methods" value="time: mean" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2026-03-12T10:42:03.448722Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision,manually inspected" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="1mn" />
    <attribute name="ebas_station_code" value="US0107R" />
    <attribute name="ebas_platform_code" value="US0107S" />
    <attribute name="ebas_station_name" value="Longmont Union Reservoir" />
    <attribute name="ebas_station_state_province" value="CO" />
    <attribute name="ebas_station_land_use" value="Agricultural" />
    <attribute name="ebas_station_setting" value="Suburban" />
    <attribute name="ebas_station_latitude" type="double" value="40.1762" />
    <attribute name="ebas_station_longitude" type="double" value="-105.0477" />
    <attribute name="ebas_station_altitude" value="1514.0 m" />
    <attribute name="ebas_measurement_height" value="8.5 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="NOx" />
    <attribute name="ebas_unit" value="ug N/m3" />
    <attribute name="ebas_matrix" value="air" />
    <attribute name="ebas_laboratory_code" value="US17L" />
    <attribute name="ebas_instrument_type" value="chemiluminescence_photolytic" />
    <attribute name="ebas_instrument_name" value="LUR_NOx" />
    <attribute name="ebas_instrument_manufacturer" value="Teledyne" />
    <attribute name="ebas_instrument_model" value="T200UP" />
    <attribute name="ebas_instrument_serial_number" value="149" />
    <attribute name="ebas_method_ref" value="US17L_Teledyne" />
    <attribute name="ebas_standard_method" value="SOP=ACTRIS_NOxy_2014" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Downward facing with hood" />
    <attribute name="ebas_ozone_correction" value="Not corrected for reaction with O3 in the inlet" />
    <attribute name="ebas_water_vapor_correction" value="Not corrected for water vapor quenching in CLD" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="passive, sample heated from atmospheric to lab temperature" />
    <attribute name="ebas_volume_std_temperature" value="273.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
    <attribute name="ebas_detection_limit" value="0.0442 ug N/m3" />
    <attribute name="ebas_detection_limit_expl" value="Determined by instrument counting statistics" />
    <attribute name="ebas_measurement_uncertainty_expl" value="The greater of 5.3% or 0.1 ppb" />
    <attribute name="ebas_zero_negative_values_code" value="Zero/negative impossible" />
    <attribute name="ebas_zero_negative_values" value="Values (1-minute) below detection limit reported as half the detection limit" />
    <attribute name="ebas_organization" value="US17L, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, USA" />
    <attribute name="ebas_framework_acronym" value="Independent" />
    <attribute name="ebas_framework_name" value="Independent data made available without official affiliation to another existing EBAS project/framework" />
    <attribute name="ebas_framework_description" value="&quot;Project established to allow reporting of data which do not have an affiliation to frameworks in EBAS. Users of &quot;&quot;Independent&quot;&quot; data should investigate the associated metadata and take contact with data originators regarding matters associated to data use&quot;" />
    <attribute name="ebas_framework_contact_name" value="Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_submitter" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_acknowledgement" value="Data used in this &lt;study/report/figure/etc.&gt; were accessed from EBAS (https://ebas.nilu.no) hosted by NILU. Specifically, the use included data affiliated with the framework: Independent. The monitoring program was funded and the data were made publicly available by the City of Longmont, Colorado, USA." />
    <attribute name="ebas_comment" value="Data are provided for informational purposes only without any representations as to accuracy or fitness for a particular purpose. -- Data converted on import into EBAS from 'nmol/mol' to 'ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.624923. Detection limit converted from '0.0707 nmol/mol' to '0.0442 ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.624923." />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/nitrogenoxidesmassconcentration" />
    <attribute name="actris_variable_preferred_term" value="nitrogen oxides mass concentration" />
    <attribute name="actris_matrix_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/gasphase" />
    <attribute name="actris_matrix_preferred_term" value="gas phase" />
    <attribute name="actris_constraints_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/expressedasnitrogen" />
    <attribute name="actris_constraints_preferred_term" value="expressed as nitrogen" />
    <attribute name="actris_timeliness_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/scheduled" />
    <attribute name="actris_timeliness_preferred_term" value="scheduled" />
    <attribute name="actris_instrument_type_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/chemiluminescencedetector-photolyticalconverter" />
    <attribute name="actris_instrument_type_preferred_term" value="chemiluminescence detector, photolytical converter" />
    <attribute name="actris_framework_uri" value="" />
    <attribute name="actris_framework_preferred_term" value="" />
    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
  </variable>
  <variable name="qc_NOx_ug_N_per_m3_amean" shape="qc_NOx_ug_N_per_m3_amean_flags time" type="int">
    <attribute name="_FillValue" type="int" value="0" />
    <attribute name="standard_name" value="status_flag" />
    <attribute name="missing_value" type="int" value="0" />
    <attribute name="units" value="1" />
  </variable>
  <variable name="meta_NOx_ug_N_per_m3_amean" shape="metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="v_NOx_nmol_per_mol_stddev" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mole_fraction_of_nox_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="nmol/mol" />
    <attribute name="ancillary_variables" value="qc_NOx_nmol_per_mol_stddev meta_NOx_nmol_per_mol_stddev" />
    <attribute name="cell_methods" value="time: standard_deviation" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2026-03-12T10:42:03.448722Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision,manually inspected" />
    <attribute name="ebas_statistics" value="stddev" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="1mn" />
    <attribute name="ebas_station_code" value="US0107R" />
    <attribute name="ebas_platform_code" value="US0107S" />
    <attribute name="ebas_station_name" value="Longmont Union Reservoir" />
    <attribute name="ebas_station_state_province" value="CO" />
    <attribute name="ebas_station_land_use" value="Agricultural" />
    <attribute name="ebas_station_setting" value="Suburban" />
    <attribute name="ebas_station_latitude" type="double" value="40.1762" />
    <attribute name="ebas_station_longitude" type="double" value="-105.0477" />
    <attribute name="ebas_station_altitude" value="1514.0 m" />
    <attribute name="ebas_measurement_height" value="8.5 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="NOx" />
    <attribute name="ebas_unit" value="nmol/mol" />
    <attribute name="ebas_matrix" value="air" />
    <attribute name="ebas_laboratory_code" value="US17L" />
    <attribute name="ebas_instrument_type" value="chemiluminescence_photolytic" />
    <attribute name="ebas_instrument_name" value="LUR_NOx" />
    <attribute name="ebas_instrument_manufacturer" value="Teledyne" />
    <attribute name="ebas_instrument_model" value="T200UP" />
    <attribute name="ebas_instrument_serial_number" value="149" />
    <attribute name="ebas_method_ref" value="US17L_Teledyne" />
    <attribute name="ebas_standard_method" value="SOP=ACTRIS_NOxy_2014" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Downward facing with hood" />
    <attribute name="ebas_ozone_correction" value="Not corrected for reaction with O3 in the inlet" />
    <attribute name="ebas_water_vapor_correction" value="Not corrected for water vapor quenching in CLD" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="passive, sample heated from atmospheric to lab temperature" />
    <attribute name="ebas_detection_limit_expl" value="Determined by instrument counting statistics" />
    <attribute name="ebas_zero_negative_values_code" value="Zero/negative impossible" />
    <attribute name="ebas_zero_negative_values" value="Values (1-minute) below detection limit reported as half the detection limit" />
    <attribute name="ebas_organization" value="US17L, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, USA" />
    <attribute name="ebas_framework_acronym" value="Independent" />
    <attribute name="ebas_framework_name" value="Independent data made available without official affiliation to another existing EBAS project/framework" />
    <attribute name="ebas_framework_description" value="&quot;Project established to allow reporting of data which do not have an affiliation to frameworks in EBAS. Users of &quot;&quot;Independent&quot;&quot; data should investigate the associated metadata and take contact with data originators regarding matters associated to data use&quot;" />
    <attribute name="ebas_framework_contact_name" value="Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_submitter" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_acknowledgement" value="Data used in this &lt;study/report/figure/etc.&gt; were accessed from EBAS (https://ebas.nilu.no) hosted by NILU. Specifically, the use included data affiliated with the framework: Independent. The monitoring program was funded and the data were made publicly available by the City of Longmont, Colorado, USA." />
    <attribute name="ebas_comment" value="Data are provided for informational purposes only without any representations as to accuracy or fitness for a particular purpose. -- Data converted on import into EBAS from 'nmol/mol' to 'ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.624923. -- Data converted on export from EBAS from 'ug N/m3' at 273.15 K, 1013.25 hPa to 'nmol/mol', conversion factor 1.60020." />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/nitrogenoxidesamountfraction" />
    <attribute name="actris_variable_preferred_term" value="nitrogen oxides amount fraction" />
    <attribute name="actris_matrix_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/gasphase" />
    <attribute name="actris_matrix_preferred_term" value="gas phase" />
    <attribute name="actris_timeliness_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/scheduled" />
    <attribute name="actris_timeliness_preferred_term" value="scheduled" />
    <attribute name="actris_instrument_type_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/chemiluminescencedetector-photolyticalconverter" />
    <attribute name="actris_instrument_type_preferred_term" value="chemiluminescence detector, photolytical converter" />
    <attribute name="actris_framework_uri" value="" />
    <attribute name="actris_framework_preferred_term" value="" />
    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
  </variable>
  <variable name="qc_NOx_nmol_per_mol_stddev" shape="qc_NOx_nmol_per_mol_stddev_flags time" type="int">
    <attribute name="_FillValue" type="int" value="0" />
    <attribute name="standard_name" value="status_flag" />
    <attribute name="missing_value" type="int" value="0" />
    <attribute name="units" value="1" />
  </variable>
  <variable name="meta_NOx_nmol_per_mol_stddev" shape="metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="v_NOx_ug_N_per_m3_stddev" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mass_concentration_of_nox_expressed_as_nitrogen_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="ug/m3" />
    <attribute name="ancillary_variables" value="qc_NOx_ug_N_per_m3_stddev meta_NOx_ug_N_per_m3_stddev" />
    <attribute name="cell_methods" value="time: standard_deviation" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2026-03-12T10:42:03.448722Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision,manually inspected" />
    <attribute name="ebas_statistics" value="stddev" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="1mn" />
    <attribute name="ebas_station_code" value="US0107R" />
    <attribute name="ebas_platform_code" value="US0107S" />
    <attribute name="ebas_station_name" value="Longmont Union Reservoir" />
    <attribute name="ebas_station_state_province" value="CO" />
    <attribute name="ebas_station_land_use" value="Agricultural" />
    <attribute name="ebas_station_setting" value="Suburban" />
    <attribute name="ebas_station_latitude" type="double" value="40.1762" />
    <attribute name="ebas_station_longitude" type="double" value="-105.0477" />
    <attribute name="ebas_station_altitude" value="1514.0 m" />
    <attribute name="ebas_measurement_height" value="8.5 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="NOx" />
    <attribute name="ebas_unit" value="ug N/m3" />
    <attribute name="ebas_matrix" value="air" />
    <attribute name="ebas_laboratory_code" value="US17L" />
    <attribute name="ebas_instrument_type" value="chemiluminescence_photolytic" />
    <attribute name="ebas_instrument_name" value="LUR_NOx" />
    <attribute name="ebas_instrument_manufacturer" value="Teledyne" />
    <attribute name="ebas_instrument_model" value="T200UP" />
    <attribute name="ebas_instrument_serial_number" value="149" />
    <attribute name="ebas_method_ref" value="US17L_Teledyne" />
    <attribute name="ebas_standard_method" value="SOP=ACTRIS_NOxy_2014" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Downward facing with hood" />
    <attribute name="ebas_ozone_correction" value="Not corrected for reaction with O3 in the inlet" />
    <attribute name="ebas_water_vapor_correction" value="Not corrected for water vapor quenching in CLD" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="passive, sample heated from atmospheric to lab temperature" />
    <attribute name="ebas_volume_std_temperature" value="273.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
    <attribute name="ebas_detection_limit_expl" value="Determined by instrument counting statistics" />
    <attribute name="ebas_zero_negative_values_code" value="Zero/negative impossible" />
    <attribute name="ebas_zero_negative_values" value="Values (1-minute) below detection limit reported as half the detection limit" />
    <attribute name="ebas_organization" value="US17L, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, USA" />
    <attribute name="ebas_framework_acronym" value="Independent" />
    <attribute name="ebas_framework_name" value="Independent data made available without official affiliation to another existing EBAS project/framework" />
    <attribute name="ebas_framework_description" value="&quot;Project established to allow reporting of data which do not have an affiliation to frameworks in EBAS. Users of &quot;&quot;Independent&quot;&quot; data should investigate the associated metadata and take contact with data originators regarding matters associated to data use&quot;" />
    <attribute name="ebas_framework_contact_name" value="Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_submitter" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_acknowledgement" value="Data used in this &lt;study/report/figure/etc.&gt; were accessed from EBAS (https://ebas.nilu.no) hosted by NILU. Specifically, the use included data affiliated with the framework: Independent. The monitoring program was funded and the data were made publicly available by the City of Longmont, Colorado, USA." />
    <attribute name="ebas_comment" value="Data are provided for informational purposes only without any representations as to accuracy or fitness for a particular purpose. -- Data converted on import into EBAS from 'nmol/mol' to 'ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.624923." />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/nitrogenoxidesmassconcentration" />
    <attribute name="actris_variable_preferred_term" value="nitrogen oxides mass concentration" />
    <attribute name="actris_matrix_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/gasphase" />
    <attribute name="actris_matrix_preferred_term" value="gas phase" />
    <attribute name="actris_constraints_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/expressedasnitrogen" />
    <attribute name="actris_constraints_preferred_term" value="expressed as nitrogen" />
    <attribute name="actris_timeliness_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/scheduled" />
    <attribute name="actris_timeliness_preferred_term" value="scheduled" />
    <attribute name="actris_instrument_type_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/chemiluminescencedetector-photolyticalconverter" />
    <attribute name="actris_instrument_type_preferred_term" value="chemiluminescence detector, photolytical converter" />
    <attribute name="actris_framework_uri" value="" />
    <attribute name="actris_framework_preferred_term" value="" />
    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
  </variable>
  <variable name="qc_NOx_ug_N_per_m3_stddev" shape="qc_NOx_ug_N_per_m3_stddev_flags time" type="int">
    <attribute name="_FillValue" type="int" value="0" />
    <attribute name="standard_name" value="status_flag" />
    <attribute name="missing_value" type="int" value="0" />
    <attribute name="units" value="1" />
  </variable>
  <variable name="meta_NOx_ug_N_per_m3_stddev" shape="metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="v_nitrogen_dioxide_nmol_per_mol_amean" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mole_fraction_of_nitrogen_dioxide_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="nmol/mol" />
    <attribute name="ancillary_variables" value="qc_nitrogen_dioxide_nmol_per_mol_amean meta_nitrogen_dioxide_nmol_per_mol_amean" />
    <attribute name="cell_methods" value="time: mean" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2026-03-12T10:42:03.448722Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision,manually inspected" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="1mn" />
    <attribute name="ebas_station_code" value="US0107R" />
    <attribute name="ebas_platform_code" value="US0107S" />
    <attribute name="ebas_station_name" value="Longmont Union Reservoir" />
    <attribute name="ebas_station_state_province" value="CO" />
    <attribute name="ebas_station_land_use" value="Agricultural" />
    <attribute name="ebas_station_setting" value="Suburban" />
    <attribute name="ebas_station_latitude" type="double" value="40.1762" />
    <attribute name="ebas_station_longitude" type="double" value="-105.0477" />
    <attribute name="ebas_station_altitude" value="1514.0 m" />
    <attribute name="ebas_measurement_height" value="8.5 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="nitrogen_dioxide" />
    <attribute name="ebas_unit" value="nmol/mol" />
    <attribute name="ebas_matrix" value="air" />
    <attribute name="ebas_laboratory_code" value="US17L" />
    <attribute name="ebas_instrument_type" value="chemiluminescence_photolytic" />
    <attribute name="ebas_instrument_name" value="LUR_NOx" />
    <attribute name="ebas_instrument_manufacturer" value="Teledyne" />
    <attribute name="ebas_instrument_model" value="T200UP" />
    <attribute name="ebas_instrument_serial_number" value="149" />
    <attribute name="ebas_method_ref" value="US17L_Teledyne" />
    <attribute name="ebas_standard_method" value="SOP=ACTRIS_NOxy_2014" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Downward facing with hood" />
    <attribute name="ebas_ozone_correction" value="Not corrected for reaction with O3 in the inlet" />
    <attribute name="ebas_water_vapor_correction" value="Not corrected for water vapor quenching in CLD" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="passive, sample heated from atmospheric to lab temperature" />
    <attribute name="ebas_detection_limit" value="0.071 nmol/mol" />
    <attribute name="ebas_detection_limit_expl" value="Determined by instrument counting statistics" />
    <attribute name="ebas_measurement_uncertainty_expl" value="The greater of 5.3% or 0.1 ppb" />
    <attribute name="ebas_zero_negative_values_code" value="Zero/negative impossible" />
    <attribute name="ebas_zero_negative_values" value="Values (1-minute) below detection limit reported as half the detection limit" />
    <attribute name="ebas_organization" value="US17L, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, USA" />
    <attribute name="ebas_framework_acronym" value="Independent" />
    <attribute name="ebas_framework_name" value="Independent data made available without official affiliation to another existing EBAS project/framework" />
    <attribute name="ebas_framework_description" value="&quot;Project established to allow reporting of data which do not have an affiliation to frameworks in EBAS. Users of &quot;&quot;Independent&quot;&quot; data should investigate the associated metadata and take contact with data originators regarding matters associated to data use&quot;" />
    <attribute name="ebas_framework_contact_name" value="Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_submitter" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_acknowledgement" value="Data used in this &lt;study/report/figure/etc.&gt; were accessed from EBAS (https://ebas.nilu.no) hosted by NILU. Specifically, the use included data affiliated with the framework: Independent. The monitoring program was funded and the data were made publicly available by the City of Longmont, Colorado, USA." />
    <attribute name="ebas_comment" value="Data are provided for informational purposes only without any representations as to accuracy or fitness for a particular purpose. -- Data converted on import into EBAS from 'nmol/mol' to 'ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.624923. Detection limit converted from '0.0707 nmol/mol' to '0.0442 ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.624923. -- Data converted on export from EBAS from 'ug N/m3' at 273.15 K, 1013.25 hPa to 'nmol/mol', conversion factor 1.60020. Detection limit converted from '0.0442 ug N/m3' at 273.15 K, 1013.25 hPa to '0.071 nmol/mol', conversion factor 1.60020." />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/nitrogendioxideamountfraction" />
    <attribute name="actris_variable_preferred_term" value="nitrogen dioxide amount fraction" />
    <attribute name="actris_matrix_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/gasphase" />
    <attribute name="actris_matrix_preferred_term" value="gas phase" />
    <attribute name="actris_timeliness_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/scheduled" />
    <attribute name="actris_timeliness_preferred_term" value="scheduled" />
    <attribute name="actris_instrument_type_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/chemiluminescencedetector-photolyticalconverter" />
    <attribute name="actris_instrument_type_preferred_term" value="chemiluminescence detector, photolytical converter" />
    <attribute name="actris_framework_uri" value="" />
    <attribute name="actris_framework_preferred_term" value="" />
    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
  </variable>
  <variable name="qc_nitrogen_dioxide_nmol_per_mol_amean" shape="qc_nitrogen_dioxide_nmol_per_mol_amean_flags time" type="int">
    <attribute name="_FillValue" type="int" value="0" />
    <attribute name="standard_name" value="status_flag" />
    <attribute name="missing_value" type="int" value="0" />
    <attribute name="units" value="1" />
  </variable>
  <variable name="meta_nitrogen_dioxide_nmol_per_mol_amean" shape="metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="v_nitrogen_dioxide_ug_N_per_m3_amean" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mass_concentration_of_nitrogen_dioxide_expressed_as_nitrogen_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="ug/m3" />
    <attribute name="ancillary_variables" value="qc_nitrogen_dioxide_ug_N_per_m3_amean meta_nitrogen_dioxide_ug_N_per_m3_amean" />
    <attribute name="cell_methods" value="time: mean" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2026-03-12T10:42:03.448722Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision,manually inspected" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="1mn" />
    <attribute name="ebas_station_code" value="US0107R" />
    <attribute name="ebas_platform_code" value="US0107S" />
    <attribute name="ebas_station_name" value="Longmont Union Reservoir" />
    <attribute name="ebas_station_state_province" value="CO" />
    <attribute name="ebas_station_land_use" value="Agricultural" />
    <attribute name="ebas_station_setting" value="Suburban" />
    <attribute name="ebas_station_latitude" type="double" value="40.1762" />
    <attribute name="ebas_station_longitude" type="double" value="-105.0477" />
    <attribute name="ebas_station_altitude" value="1514.0 m" />
    <attribute name="ebas_measurement_height" value="8.5 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="nitrogen_dioxide" />
    <attribute name="ebas_unit" value="ug N/m3" />
    <attribute name="ebas_matrix" value="air" />
    <attribute name="ebas_laboratory_code" value="US17L" />
    <attribute name="ebas_instrument_type" value="chemiluminescence_photolytic" />
    <attribute name="ebas_instrument_name" value="LUR_NOx" />
    <attribute name="ebas_instrument_manufacturer" value="Teledyne" />
    <attribute name="ebas_instrument_model" value="T200UP" />
    <attribute name="ebas_instrument_serial_number" value="149" />
    <attribute name="ebas_method_ref" value="US17L_Teledyne" />
    <attribute name="ebas_standard_method" value="SOP=ACTRIS_NOxy_2014" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Downward facing with hood" />
    <attribute name="ebas_ozone_correction" value="Not corrected for reaction with O3 in the inlet" />
    <attribute name="ebas_water_vapor_correction" value="Not corrected for water vapor quenching in CLD" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="passive, sample heated from atmospheric to lab temperature" />
    <attribute name="ebas_volume_std_temperature" value="273.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
    <attribute name="ebas_detection_limit" value="0.0442 ug N/m3" />
    <attribute name="ebas_detection_limit_expl" value="Determined by instrument counting statistics" />
    <attribute name="ebas_measurement_uncertainty_expl" value="The greater of 5.3% or 0.1 ppb" />
    <attribute name="ebas_zero_negative_values_code" value="Zero/negative impossible" />
    <attribute name="ebas_zero_negative_values" value="Values (1-minute) below detection limit reported as half the detection limit" />
    <attribute name="ebas_organization" value="US17L, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, USA" />
    <attribute name="ebas_framework_acronym" value="Independent" />
    <attribute name="ebas_framework_name" value="Independent data made available without official affiliation to another existing EBAS project/framework" />
    <attribute name="ebas_framework_description" value="&quot;Project established to allow reporting of data which do not have an affiliation to frameworks in EBAS. Users of &quot;&quot;Independent&quot;&quot; data should investigate the associated metadata and take contact with data originators regarding matters associated to data use&quot;" />
    <attribute name="ebas_framework_contact_name" value="Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_submitter" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_acknowledgement" value="Data used in this &lt;study/report/figure/etc.&gt; were accessed from EBAS (https://ebas.nilu.no) hosted by NILU. Specifically, the use included data affiliated with the framework: Independent. The monitoring program was funded and the data were made publicly available by the City of Longmont, Colorado, USA." />
    <attribute name="ebas_comment" value="Data are provided for informational purposes only without any representations as to accuracy or fitness for a particular purpose. -- Data converted on import into EBAS from 'nmol/mol' to 'ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.624923. Detection limit converted from '0.0707 nmol/mol' to '0.0442 ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.624923." />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/nitrogendioxidemassconcentration" />
    <attribute name="actris_variable_preferred_term" value="nitrogen dioxide mass concentration" />
    <attribute name="actris_matrix_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/gasphase" />
    <attribute name="actris_matrix_preferred_term" value="gas phase" />
    <attribute name="actris_constraints_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/expressedasnitrogen" />
    <attribute name="actris_constraints_preferred_term" value="expressed as nitrogen" />
    <attribute name="actris_timeliness_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/scheduled" />
    <attribute name="actris_timeliness_preferred_term" value="scheduled" />
    <attribute name="actris_instrument_type_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/chemiluminescencedetector-photolyticalconverter" />
    <attribute name="actris_instrument_type_preferred_term" value="chemiluminescence detector, photolytical converter" />
    <attribute name="actris_framework_uri" value="" />
    <attribute name="actris_framework_preferred_term" value="" />
    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
  </variable>
  <variable name="qc_nitrogen_dioxide_ug_N_per_m3_amean" shape="qc_nitrogen_dioxide_ug_N_per_m3_amean_flags time" type="int">
    <attribute name="_FillValue" type="int" value="0" />
    <attribute name="standard_name" value="status_flag" />
    <attribute name="missing_value" type="int" value="0" />
    <attribute name="units" value="1" />
  </variable>
  <variable name="meta_nitrogen_dioxide_ug_N_per_m3_amean" shape="metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="v_nitrogen_dioxide_nmol_per_mol_stddev" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mole_fraction_of_nitrogen_dioxide_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="nmol/mol" />
    <attribute name="ancillary_variables" value="qc_nitrogen_dioxide_nmol_per_mol_stddev meta_nitrogen_dioxide_nmol_per_mol_stddev" />
    <attribute name="cell_methods" value="time: standard_deviation" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2026-03-12T10:42:03.448722Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision,manually inspected" />
    <attribute name="ebas_statistics" value="stddev" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="1mn" />
    <attribute name="ebas_station_code" value="US0107R" />
    <attribute name="ebas_platform_code" value="US0107S" />
    <attribute name="ebas_station_name" value="Longmont Union Reservoir" />
    <attribute name="ebas_station_state_province" value="CO" />
    <attribute name="ebas_station_land_use" value="Agricultural" />
    <attribute name="ebas_station_setting" value="Suburban" />
    <attribute name="ebas_station_latitude" type="double" value="40.1762" />
    <attribute name="ebas_station_longitude" type="double" value="-105.0477" />
    <attribute name="ebas_station_altitude" value="1514.0 m" />
    <attribute name="ebas_measurement_height" value="8.5 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="nitrogen_dioxide" />
    <attribute name="ebas_unit" value="nmol/mol" />
    <attribute name="ebas_matrix" value="air" />
    <attribute name="ebas_laboratory_code" value="US17L" />
    <attribute name="ebas_instrument_type" value="chemiluminescence_photolytic" />
    <attribute name="ebas_instrument_name" value="LUR_NOx" />
    <attribute name="ebas_instrument_manufacturer" value="Teledyne" />
    <attribute name="ebas_instrument_model" value="T200UP" />
    <attribute name="ebas_instrument_serial_number" value="149" />
    <attribute name="ebas_method_ref" value="US17L_Teledyne" />
    <attribute name="ebas_standard_method" value="SOP=ACTRIS_NOxy_2014" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Downward facing with hood" />
    <attribute name="ebas_ozone_correction" value="Not corrected for reaction with O3 in the inlet" />
    <attribute name="ebas_water_vapor_correction" value="Not corrected for water vapor quenching in CLD" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="passive, sample heated from atmospheric to lab temperature" />
    <attribute name="ebas_detection_limit_expl" value="Determined by instrument counting statistics" />
    <attribute name="ebas_zero_negative_values_code" value="Zero/negative impossible" />
    <attribute name="ebas_zero_negative_values" value="Values (1-minute) below detection limit reported as half the detection limit" />
    <attribute name="ebas_organization" value="US17L, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, USA" />
    <attribute name="ebas_framework_acronym" value="Independent" />
    <attribute name="ebas_framework_name" value="Independent data made available without official affiliation to another existing EBAS project/framework" />
    <attribute name="ebas_framework_description" value="&quot;Project established to allow reporting of data which do not have an affiliation to frameworks in EBAS. Users of &quot;&quot;Independent&quot;&quot; data should investigate the associated metadata and take contact with data originators regarding matters associated to data use&quot;" />
    <attribute name="ebas_framework_contact_name" value="Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_submitter" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_acknowledgement" value="Data used in this &lt;study/report/figure/etc.&gt; were accessed from EBAS (https://ebas.nilu.no) hosted by NILU. Specifically, the use included data affiliated with the framework: Independent. The monitoring program was funded and the data were made publicly available by the City of Longmont, Colorado, USA." />
    <attribute name="ebas_comment" value="Data are provided for informational purposes only without any representations as to accuracy or fitness for a particular purpose. -- Data converted on import into EBAS from 'nmol/mol' to 'ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.624923. -- Data converted on export from EBAS from 'ug N/m3' at 273.15 K, 1013.25 hPa to 'nmol/mol', conversion factor 1.60020." />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/nitrogendioxideamountfraction" />
    <attribute name="actris_variable_preferred_term" value="nitrogen dioxide amount fraction" />
    <attribute name="actris_matrix_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/gasphase" />
    <attribute name="actris_matrix_preferred_term" value="gas phase" />
    <attribute name="actris_timeliness_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/scheduled" />
    <attribute name="actris_timeliness_preferred_term" value="scheduled" />
    <attribute name="actris_instrument_type_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/chemiluminescencedetector-photolyticalconverter" />
    <attribute name="actris_instrument_type_preferred_term" value="chemiluminescence detector, photolytical converter" />
    <attribute name="actris_framework_uri" value="" />
    <attribute name="actris_framework_preferred_term" value="" />
    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
  </variable>
  <variable name="qc_nitrogen_dioxide_nmol_per_mol_stddev" shape="qc_nitrogen_dioxide_nmol_per_mol_stddev_flags time" type="int">
    <attribute name="_FillValue" type="int" value="0" />
    <attribute name="standard_name" value="status_flag" />
    <attribute name="missing_value" type="int" value="0" />
    <attribute name="units" value="1" />
  </variable>
  <variable name="meta_nitrogen_dioxide_nmol_per_mol_stddev" shape="metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="v_nitrogen_dioxide_ug_N_per_m3_stddev" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mass_concentration_of_nitrogen_dioxide_expressed_as_nitrogen_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="ug/m3" />
    <attribute name="ancillary_variables" value="qc_nitrogen_dioxide_ug_N_per_m3_stddev meta_nitrogen_dioxide_ug_N_per_m3_stddev" />
    <attribute name="cell_methods" value="time: standard_deviation" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2026-03-12T10:42:03.448722Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision,manually inspected" />
    <attribute name="ebas_statistics" value="stddev" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="1mn" />
    <attribute name="ebas_station_code" value="US0107R" />
    <attribute name="ebas_platform_code" value="US0107S" />
    <attribute name="ebas_station_name" value="Longmont Union Reservoir" />
    <attribute name="ebas_station_state_province" value="CO" />
    <attribute name="ebas_station_land_use" value="Agricultural" />
    <attribute name="ebas_station_setting" value="Suburban" />
    <attribute name="ebas_station_latitude" type="double" value="40.1762" />
    <attribute name="ebas_station_longitude" type="double" value="-105.0477" />
    <attribute name="ebas_station_altitude" value="1514.0 m" />
    <attribute name="ebas_measurement_height" value="8.5 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="nitrogen_dioxide" />
    <attribute name="ebas_unit" value="ug N/m3" />
    <attribute name="ebas_matrix" value="air" />
    <attribute name="ebas_laboratory_code" value="US17L" />
    <attribute name="ebas_instrument_type" value="chemiluminescence_photolytic" />
    <attribute name="ebas_instrument_name" value="LUR_NOx" />
    <attribute name="ebas_instrument_manufacturer" value="Teledyne" />
    <attribute name="ebas_instrument_model" value="T200UP" />
    <attribute name="ebas_instrument_serial_number" value="149" />
    <attribute name="ebas_method_ref" value="US17L_Teledyne" />
    <attribute name="ebas_standard_method" value="SOP=ACTRIS_NOxy_2014" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Downward facing with hood" />
    <attribute name="ebas_ozone_correction" value="Not corrected for reaction with O3 in the inlet" />
    <attribute name="ebas_water_vapor_correction" value="Not corrected for water vapor quenching in CLD" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="passive, sample heated from atmospheric to lab temperature" />
    <attribute name="ebas_volume_std_temperature" value="273.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
    <attribute name="ebas_detection_limit_expl" value="Determined by instrument counting statistics" />
    <attribute name="ebas_zero_negative_values_code" value="Zero/negative impossible" />
    <attribute name="ebas_zero_negative_values" value="Values (1-minute) below detection limit reported as half the detection limit" />
    <attribute name="ebas_organization" value="US17L, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, USA" />
    <attribute name="ebas_framework_acronym" value="Independent" />
    <attribute name="ebas_framework_name" value="Independent data made available without official affiliation to another existing EBAS project/framework" />
    <attribute name="ebas_framework_description" value="&quot;Project established to allow reporting of data which do not have an affiliation to frameworks in EBAS. Users of &quot;&quot;Independent&quot;&quot; data should investigate the associated metadata and take contact with data originators regarding matters associated to data use&quot;" />
    <attribute name="ebas_framework_contact_name" value="Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_submitter" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_acknowledgement" value="Data used in this &lt;study/report/figure/etc.&gt; were accessed from EBAS (https://ebas.nilu.no) hosted by NILU. Specifically, the use included data affiliated with the framework: Independent. The monitoring program was funded and the data were made publicly available by the City of Longmont, Colorado, USA." />
    <attribute name="ebas_comment" value="Data are provided for informational purposes only without any representations as to accuracy or fitness for a particular purpose. -- Data converted on import into EBAS from 'nmol/mol' to 'ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.624923." />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/nitrogendioxidemassconcentration" />
    <attribute name="actris_variable_preferred_term" value="nitrogen dioxide mass concentration" />
    <attribute name="actris_matrix_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/gasphase" />
    <attribute name="actris_matrix_preferred_term" value="gas phase" />
    <attribute name="actris_constraints_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/expressedasnitrogen" />
    <attribute name="actris_constraints_preferred_term" value="expressed as nitrogen" />
    <attribute name="actris_timeliness_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/scheduled" />
    <attribute name="actris_timeliness_preferred_term" value="scheduled" />
    <attribute name="actris_instrument_type_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/chemiluminescencedetector-photolyticalconverter" />
    <attribute name="actris_instrument_type_preferred_term" value="chemiluminescence detector, photolytical converter" />
    <attribute name="actris_framework_uri" value="" />
    <attribute name="actris_framework_preferred_term" value="" />
    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
  </variable>
  <variable name="qc_nitrogen_dioxide_ug_N_per_m3_stddev" shape="qc_nitrogen_dioxide_ug_N_per_m3_stddev_flags time" type="int">
    <attribute name="_FillValue" type="int" value="0" />
    <attribute name="standard_name" value="status_flag" />
    <attribute name="missing_value" type="int" value="0" />
    <attribute name="units" value="1" />
  </variable>
  <variable name="meta_nitrogen_dioxide_ug_N_per_m3_stddev" shape="metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="v_nitrogen_monoxide_nmol_per_mol_amean" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mole_fraction_of_nitrogen_monoxide_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="nmol/mol" />
    <attribute name="ancillary_variables" value="qc_nitrogen_monoxide_nmol_per_mol_amean meta_nitrogen_monoxide_nmol_per_mol_amean" />
    <attribute name="cell_methods" value="time: mean" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2026-03-12T10:42:03.448722Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision,manually inspected" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="1mn" />
    <attribute name="ebas_station_code" value="US0107R" />
    <attribute name="ebas_platform_code" value="US0107S" />
    <attribute name="ebas_station_name" value="Longmont Union Reservoir" />
    <attribute name="ebas_station_state_province" value="CO" />
    <attribute name="ebas_station_land_use" value="Agricultural" />
    <attribute name="ebas_station_setting" value="Suburban" />
    <attribute name="ebas_station_latitude" type="double" value="40.1762" />
    <attribute name="ebas_station_longitude" type="double" value="-105.0477" />
    <attribute name="ebas_station_altitude" value="1514.0 m" />
    <attribute name="ebas_measurement_height" value="8.5 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="nitrogen_monoxide" />
    <attribute name="ebas_unit" value="nmol/mol" />
    <attribute name="ebas_matrix" value="air" />
    <attribute name="ebas_laboratory_code" value="US17L" />
    <attribute name="ebas_instrument_type" value="chemiluminescence_photolytic" />
    <attribute name="ebas_instrument_name" value="LUR_NOx" />
    <attribute name="ebas_instrument_manufacturer" value="Teledyne" />
    <attribute name="ebas_instrument_model" value="T200UP" />
    <attribute name="ebas_instrument_serial_number" value="149" />
    <attribute name="ebas_method_ref" value="US17L_Teledyne" />
    <attribute name="ebas_standard_method" value="SOP=ACTRIS_NOxy_2014" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Downward facing with hood" />
    <attribute name="ebas_ozone_correction" value="Not corrected for reaction with O3 in the inlet" />
    <attribute name="ebas_water_vapor_correction" value="Not corrected for water vapor quenching in CLD" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="passive, sample heated from atmospheric to lab temperature" />
    <attribute name="ebas_detection_limit" value="0.071 nmol/mol" />
    <attribute name="ebas_detection_limit_expl" value="Determined by instrument counting statistics" />
    <attribute name="ebas_measurement_uncertainty_expl" value="The greater of 5.3% or 0.1 ppb" />
    <attribute name="ebas_zero_negative_values_code" value="Zero/negative impossible" />
    <attribute name="ebas_zero_negative_values" value="Values (1-minute) below detection limit reported as half the detection limit" />
    <attribute name="ebas_organization" value="US17L, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, USA" />
    <attribute name="ebas_framework_acronym" value="Independent" />
    <attribute name="ebas_framework_name" value="Independent data made available without official affiliation to another existing EBAS project/framework" />
    <attribute name="ebas_framework_description" value="&quot;Project established to allow reporting of data which do not have an affiliation to frameworks in EBAS. Users of &quot;&quot;Independent&quot;&quot; data should investigate the associated metadata and take contact with data originators regarding matters associated to data use&quot;" />
    <attribute name="ebas_framework_contact_name" value="Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_submitter" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_acknowledgement" value="Data used in this &lt;study/report/figure/etc.&gt; were accessed from EBAS (https://ebas.nilu.no) hosted by NILU. Specifically, the use included data affiliated with the framework: Independent. The monitoring program was funded and the data were made publicly available by the City of Longmont, Colorado, USA." />
    <attribute name="ebas_comment" value="Data are provided for informational purposes only without any representations as to accuracy or fitness for a particular purpose. -- Data converted on import into EBAS from 'nmol/mol' to 'ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.624923. Detection limit converted from '0.0707 nmol/mol' to '0.0442 ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.624923. -- Data converted on export from EBAS from 'ug N/m3' at 273.15 K, 1013.25 hPa to 'nmol/mol', conversion factor 1.60020. Detection limit converted from '0.0442 ug N/m3' at 273.15 K, 1013.25 hPa to '0.071 nmol/mol', conversion factor 1.60020." />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/nitricoxideamountfraction" />
    <attribute name="actris_variable_preferred_term" value="nitric oxide amount fraction" />
    <attribute name="actris_matrix_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/gasphase" />
    <attribute name="actris_matrix_preferred_term" value="gas phase" />
    <attribute name="actris_timeliness_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/scheduled" />
    <attribute name="actris_timeliness_preferred_term" value="scheduled" />
    <attribute name="actris_instrument_type_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/chemiluminescencedetector-photolyticalconverter" />
    <attribute name="actris_instrument_type_preferred_term" value="chemiluminescence detector, photolytical converter" />
    <attribute name="actris_framework_uri" value="" />
    <attribute name="actris_framework_preferred_term" value="" />
    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
  </variable>
  <variable name="qc_nitrogen_monoxide_nmol_per_mol_amean" shape="qc_nitrogen_monoxide_nmol_per_mol_amean_flags time" type="int">
    <attribute name="_FillValue" type="int" value="0" />
    <attribute name="standard_name" value="status_flag" />
    <attribute name="missing_value" type="int" value="0" />
    <attribute name="units" value="1" />
  </variable>
  <variable name="meta_nitrogen_monoxide_nmol_per_mol_amean" shape="metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="v_nitrogen_monoxide_ug_N_per_m3_amean" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mass_concentration_of_nitrogen_monoxide_expressed_as_nitrogen_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="ug/m3" />
    <attribute name="ancillary_variables" value="qc_nitrogen_monoxide_ug_N_per_m3_amean meta_nitrogen_monoxide_ug_N_per_m3_amean" />
    <attribute name="cell_methods" value="time: mean" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2026-03-12T10:42:03.448722Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision,manually inspected" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="1mn" />
    <attribute name="ebas_station_code" value="US0107R" />
    <attribute name="ebas_platform_code" value="US0107S" />
    <attribute name="ebas_station_name" value="Longmont Union Reservoir" />
    <attribute name="ebas_station_state_province" value="CO" />
    <attribute name="ebas_station_land_use" value="Agricultural" />
    <attribute name="ebas_station_setting" value="Suburban" />
    <attribute name="ebas_station_latitude" type="double" value="40.1762" />
    <attribute name="ebas_station_longitude" type="double" value="-105.0477" />
    <attribute name="ebas_station_altitude" value="1514.0 m" />
    <attribute name="ebas_measurement_height" value="8.5 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="nitrogen_monoxide" />
    <attribute name="ebas_unit" value="ug N/m3" />
    <attribute name="ebas_matrix" value="air" />
    <attribute name="ebas_laboratory_code" value="US17L" />
    <attribute name="ebas_instrument_type" value="chemiluminescence_photolytic" />
    <attribute name="ebas_instrument_name" value="LUR_NOx" />
    <attribute name="ebas_instrument_manufacturer" value="Teledyne" />
    <attribute name="ebas_instrument_model" value="T200UP" />
    <attribute name="ebas_instrument_serial_number" value="149" />
    <attribute name="ebas_method_ref" value="US17L_Teledyne" />
    <attribute name="ebas_standard_method" value="SOP=ACTRIS_NOxy_2014" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Downward facing with hood" />
    <attribute name="ebas_ozone_correction" value="Not corrected for reaction with O3 in the inlet" />
    <attribute name="ebas_water_vapor_correction" value="Not corrected for water vapor quenching in CLD" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="passive, sample heated from atmospheric to lab temperature" />
    <attribute name="ebas_volume_std_temperature" value="273.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
    <attribute name="ebas_detection_limit" value="0.0442 ug N/m3" />
    <attribute name="ebas_detection_limit_expl" value="Determined by instrument counting statistics" />
    <attribute name="ebas_measurement_uncertainty_expl" value="The greater of 5.3% or 0.1 ppb" />
    <attribute name="ebas_zero_negative_values_code" value="Zero/negative impossible" />
    <attribute name="ebas_zero_negative_values" value="Values (1-minute) below detection limit reported as half the detection limit" />
    <attribute name="ebas_organization" value="US17L, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, USA" />
    <attribute name="ebas_framework_acronym" value="Independent" />
    <attribute name="ebas_framework_name" value="Independent data made available without official affiliation to another existing EBAS project/framework" />
    <attribute name="ebas_framework_description" value="&quot;Project established to allow reporting of data which do not have an affiliation to frameworks in EBAS. Users of &quot;&quot;Independent&quot;&quot; data should investigate the associated metadata and take contact with data originators regarding matters associated to data use&quot;" />
    <attribute name="ebas_framework_contact_name" value="Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_submitter" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_acknowledgement" value="Data used in this &lt;study/report/figure/etc.&gt; were accessed from EBAS (https://ebas.nilu.no) hosted by NILU. Specifically, the use included data affiliated with the framework: Independent. The monitoring program was funded and the data were made publicly available by the City of Longmont, Colorado, USA." />
    <attribute name="ebas_comment" value="Data are provided for informational purposes only without any representations as to accuracy or fitness for a particular purpose. -- Data converted on import into EBAS from 'nmol/mol' to 'ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.624923. Detection limit converted from '0.0707 nmol/mol' to '0.0442 ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.624923." />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/nitricoxidemassconcentration" />
    <attribute name="actris_variable_preferred_term" value="nitric oxide mass concentration" />
    <attribute name="actris_matrix_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/gasphase" />
    <attribute name="actris_matrix_preferred_term" value="gas phase" />
    <attribute name="actris_constraints_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/expressedasnitrogen" />
    <attribute name="actris_constraints_preferred_term" value="expressed as nitrogen" />
    <attribute name="actris_timeliness_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/scheduled" />
    <attribute name="actris_timeliness_preferred_term" value="scheduled" />
    <attribute name="actris_instrument_type_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/chemiluminescencedetector-photolyticalconverter" />
    <attribute name="actris_instrument_type_preferred_term" value="chemiluminescence detector, photolytical converter" />
    <attribute name="actris_framework_uri" value="" />
    <attribute name="actris_framework_preferred_term" value="" />
    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
  </variable>
  <variable name="qc_nitrogen_monoxide_ug_N_per_m3_amean" shape="qc_nitrogen_monoxide_ug_N_per_m3_amean_flags time" type="int">
    <attribute name="_FillValue" type="int" value="0" />
    <attribute name="standard_name" value="status_flag" />
    <attribute name="missing_value" type="int" value="0" />
    <attribute name="units" value="1" />
  </variable>
  <variable name="meta_nitrogen_monoxide_ug_N_per_m3_amean" shape="metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="v_nitrogen_monoxide_nmol_per_mol_stddev" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mole_fraction_of_nitrogen_monoxide_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="nmol/mol" />
    <attribute name="ancillary_variables" value="qc_nitrogen_monoxide_nmol_per_mol_stddev meta_nitrogen_monoxide_nmol_per_mol_stddev" />
    <attribute name="cell_methods" value="time: standard_deviation" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2026-03-12T10:42:03.448722Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision,manually inspected" />
    <attribute name="ebas_statistics" value="stddev" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="1mn" />
    <attribute name="ebas_station_code" value="US0107R" />
    <attribute name="ebas_platform_code" value="US0107S" />
    <attribute name="ebas_station_name" value="Longmont Union Reservoir" />
    <attribute name="ebas_station_state_province" value="CO" />
    <attribute name="ebas_station_land_use" value="Agricultural" />
    <attribute name="ebas_station_setting" value="Suburban" />
    <attribute name="ebas_station_latitude" type="double" value="40.1762" />
    <attribute name="ebas_station_longitude" type="double" value="-105.0477" />
    <attribute name="ebas_station_altitude" value="1514.0 m" />
    <attribute name="ebas_measurement_height" value="8.5 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="nitrogen_monoxide" />
    <attribute name="ebas_unit" value="nmol/mol" />
    <attribute name="ebas_matrix" value="air" />
    <attribute name="ebas_laboratory_code" value="US17L" />
    <attribute name="ebas_instrument_type" value="chemiluminescence_photolytic" />
    <attribute name="ebas_instrument_name" value="LUR_NOx" />
    <attribute name="ebas_instrument_manufacturer" value="Teledyne" />
    <attribute name="ebas_instrument_model" value="T200UP" />
    <attribute name="ebas_instrument_serial_number" value="149" />
    <attribute name="ebas_method_ref" value="US17L_Teledyne" />
    <attribute name="ebas_standard_method" value="SOP=ACTRIS_NOxy_2014" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Downward facing with hood" />
    <attribute name="ebas_ozone_correction" value="Not corrected for reaction with O3 in the inlet" />
    <attribute name="ebas_water_vapor_correction" value="Not corrected for water vapor quenching in CLD" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="passive, sample heated from atmospheric to lab temperature" />
    <attribute name="ebas_detection_limit_expl" value="Determined by instrument counting statistics" />
    <attribute name="ebas_zero_negative_values_code" value="Zero/negative impossible" />
    <attribute name="ebas_zero_negative_values" value="Values (1-minute) below detection limit reported as half the detection limit" />
    <attribute name="ebas_organization" value="US17L, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, USA" />
    <attribute name="ebas_framework_acronym" value="Independent" />
    <attribute name="ebas_framework_name" value="Independent data made available without official affiliation to another existing EBAS project/framework" />
    <attribute name="ebas_framework_description" value="&quot;Project established to allow reporting of data which do not have an affiliation to frameworks in EBAS. Users of &quot;&quot;Independent&quot;&quot; data should investigate the associated metadata and take contact with data originators regarding matters associated to data use&quot;" />
    <attribute name="ebas_framework_contact_name" value="Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_submitter" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_acknowledgement" value="Data used in this &lt;study/report/figure/etc.&gt; were accessed from EBAS (https://ebas.nilu.no) hosted by NILU. Specifically, the use included data affiliated with the framework: Independent. The monitoring program was funded and the data were made publicly available by the City of Longmont, Colorado, USA." />
    <attribute name="ebas_comment" value="Data are provided for informational purposes only without any representations as to accuracy or fitness for a particular purpose. -- Data converted on import into EBAS from 'nmol/mol' to 'ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.624923. -- Data converted on export from EBAS from 'ug N/m3' at 273.15 K, 1013.25 hPa to 'nmol/mol', conversion factor 1.60020." />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/nitricoxideamountfraction" />
    <attribute name="actris_variable_preferred_term" value="nitric oxide amount fraction" />
    <attribute name="actris_matrix_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/gasphase" />
    <attribute name="actris_matrix_preferred_term" value="gas phase" />
    <attribute name="actris_timeliness_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/scheduled" />
    <attribute name="actris_timeliness_preferred_term" value="scheduled" />
    <attribute name="actris_instrument_type_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/chemiluminescencedetector-photolyticalconverter" />
    <attribute name="actris_instrument_type_preferred_term" value="chemiluminescence detector, photolytical converter" />
    <attribute name="actris_framework_uri" value="" />
    <attribute name="actris_framework_preferred_term" value="" />
    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
  </variable>
  <variable name="qc_nitrogen_monoxide_nmol_per_mol_stddev" shape="qc_nitrogen_monoxide_nmol_per_mol_stddev_flags time" type="int">
    <attribute name="_FillValue" type="int" value="0" />
    <attribute name="standard_name" value="status_flag" />
    <attribute name="missing_value" type="int" value="0" />
    <attribute name="units" value="1" />
  </variable>
  <variable name="meta_nitrogen_monoxide_nmol_per_mol_stddev" shape="metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="v_nitrogen_monoxide_ug_N_per_m3_stddev" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mass_concentration_of_nitrogen_monoxide_expressed_as_nitrogen_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="ug/m3" />
    <attribute name="ancillary_variables" value="qc_nitrogen_monoxide_ug_N_per_m3_stddev meta_nitrogen_monoxide_ug_N_per_m3_stddev" />
    <attribute name="cell_methods" value="time: standard_deviation" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2026-03-12T10:42:03.448722Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision,manually inspected" />
    <attribute name="ebas_statistics" value="stddev" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="1mn" />
    <attribute name="ebas_station_code" value="US0107R" />
    <attribute name="ebas_platform_code" value="US0107S" />
    <attribute name="ebas_station_name" value="Longmont Union Reservoir" />
    <attribute name="ebas_station_state_province" value="CO" />
    <attribute name="ebas_station_land_use" value="Agricultural" />
    <attribute name="ebas_station_setting" value="Suburban" />
    <attribute name="ebas_station_latitude" type="double" value="40.1762" />
    <attribute name="ebas_station_longitude" type="double" value="-105.0477" />
    <attribute name="ebas_station_altitude" value="1514.0 m" />
    <attribute name="ebas_measurement_height" value="8.5 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="nitrogen_monoxide" />
    <attribute name="ebas_unit" value="ug N/m3" />
    <attribute name="ebas_matrix" value="air" />
    <attribute name="ebas_laboratory_code" value="US17L" />
    <attribute name="ebas_instrument_type" value="chemiluminescence_photolytic" />
    <attribute name="ebas_instrument_name" value="LUR_NOx" />
    <attribute name="ebas_instrument_manufacturer" value="Teledyne" />
    <attribute name="ebas_instrument_model" value="T200UP" />
    <attribute name="ebas_instrument_serial_number" value="149" />
    <attribute name="ebas_method_ref" value="US17L_Teledyne" />
    <attribute name="ebas_standard_method" value="SOP=ACTRIS_NOxy_2014" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Downward facing with hood" />
    <attribute name="ebas_ozone_correction" value="Not corrected for reaction with O3 in the inlet" />
    <attribute name="ebas_water_vapor_correction" value="Not corrected for water vapor quenching in CLD" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="passive, sample heated from atmospheric to lab temperature" />
    <attribute name="ebas_volume_std_temperature" value="273.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
    <attribute name="ebas_detection_limit_expl" value="Determined by instrument counting statistics" />
    <attribute name="ebas_zero_negative_values_code" value="Zero/negative impossible" />
    <attribute name="ebas_zero_negative_values" value="Values (1-minute) below detection limit reported as half the detection limit" />
    <attribute name="ebas_organization" value="US17L, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, USA" />
    <attribute name="ebas_framework_acronym" value="Independent" />
    <attribute name="ebas_framework_name" value="Independent data made available without official affiliation to another existing EBAS project/framework" />
    <attribute name="ebas_framework_description" value="&quot;Project established to allow reporting of data which do not have an affiliation to frameworks in EBAS. Users of &quot;&quot;Independent&quot;&quot; data should investigate the associated metadata and take contact with data originators regarding matters associated to data use&quot;" />
    <attribute name="ebas_framework_contact_name" value="Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_submitter" value="&quot;Helmig, Detlev, dh.bouldair@gmail.com, Boulder Atmosphere Innovation Research LLC, Boulder AIR, , 2820 Lafayette Drive, , 80305, Boulder, United States of America, ORCID=0000-0003-1612-1651&quot;" />
    <attribute name="ebas_acknowledgement" value="Data used in this &lt;study/report/figure/etc.&gt; were accessed from EBAS (https://ebas.nilu.no) hosted by NILU. Specifically, the use included data affiliated with the framework: Independent. The monitoring program was funded and the data were made publicly available by the City of Longmont, Colorado, USA." />
    <attribute name="ebas_comment" value="Data are provided for informational purposes only without any representations as to accuracy or fitness for a particular purpose. -- Data converted on import into EBAS from 'nmol/mol' to 'ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.624923." />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/nitricoxidemassconcentration" />
    <attribute name="actris_variable_preferred_term" value="nitric oxide mass concentration" />
    <attribute name="actris_matrix_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/gasphase" />
    <attribute name="actris_matrix_preferred_term" value="gas phase" />
    <attribute name="actris_constraints_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/expressedasnitrogen" />
    <attribute name="actris_constraints_preferred_term" value="expressed as nitrogen" />
    <attribute name="actris_timeliness_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/scheduled" />
    <attribute name="actris_timeliness_preferred_term" value="scheduled" />
    <attribute name="actris_instrument_type_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/chemiluminescencedetector-photolyticalconverter" />
    <attribute name="actris_instrument_type_preferred_term" value="chemiluminescence detector, photolytical converter" />
    <attribute name="actris_framework_uri" value="" />
    <attribute name="actris_framework_preferred_term" value="" />
    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
  </variable>
  <variable name="qc_nitrogen_monoxide_ug_N_per_m3_stddev" shape="qc_nitrogen_monoxide_ug_N_per_m3_stddev_flags time" type="int">
    <attribute name="_FillValue" type="int" value="0" />
    <attribute name="standard_name" value="status_flag" />
    <attribute name="missing_value" type="int" value="0" />
    <attribute name="units" value="1" />
  </variable>
  <variable name="meta_nitrogen_monoxide_ug_N_per_m3_stddev" shape="metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="time" shape="time" type="double">
    <attribute name="long_name" value="time of measurement" />
    <attribute name="standard_name" value="time" />
    <attribute name="units" value="days since 1900-01-01T00:00:00Z" />
    <attribute name="axis" value="T" />
    <attribute name="calendar" value="standard" />
    <attribute name="bounds" value="time_bnds" />
    <attribute name="_CoordinateAxisType" value="Time" />
  </variable>
  <variable name="metadata_time" shape="metadata_time" type="double">
    <attribute name="long_name" value="time of ebas metadata intervals" />
    <attribute name="standard_name" value="time" />
    <attribute name="units" value="days since 1900-01-01T00:00:00Z" />
    <attribute name="axis" value="T" />
    <attribute name="calendar" value="standard" />
    <attribute name="bounds" value="metadata_time_bnds" />
    <attribute name="_CoordinateAxisType" value="Time" />
  </variable>
</netcdf>
