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  <attribute name="title" value="Nitrogen oxides at Cape Verde Atmospheric Observatory" />
  <attribute name="summary" value="Nitrogen oxides at Cape Verde Atmospheric Observatory. These measurements are gathered as a part of the following projects ACTRIS, GAW-WDCRG 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)']" />
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  <attribute name="doi" value="https://doi.org/10.48597/RDN6-CWQE" />
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  <attribute name="citation" value="Callaghan, A., Nelson, B., ACTRIS, GAW-WDCRG, 2025, Nitrogen oxides at Cape Verde Atmospheric Observatory, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/RDN6-CWQE" />
  <attribute name="source" value="surface observation" />
  <attribute name="institution" value="GB12L &quot;National Centre for Atmospheric Science&quot; NCAS &quot;Department of Chemistry&quot; &quot;University of York&quot; &quot;YO10 5DD&quot; York &quot;United Kingdom&quot;" />
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  <attribute name="date_created" value="2026-06-11T12:08:21.287366Z" />
  <attribute name="date_metadata_modified" value="2025-06-13T14:53:59Z" />
  <attribute name="creator_name" value="Anna Callaghan, Beth Nelson" />
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  <attribute name="contributor_name" value="Anna Callaghan, Robert Wegener, Beth Nelson" />
  <attribute name="contributor_role" value="data submitter, data submitter, data submitter" />
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  <attribute name="publisher_name" value="NILU - Norwegian Institute for Air Research, ATMOS, EBAS" />
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  <attribute name="ebas_framework_description" value="&quot;ACTRIS is the European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases. ACTRIS is composed of observing stations, exploratory platforms, instruments calibration centres, and a data centre.&quot;, The World Data Centre for Reactive Gases is the data repository and archive for reactive gases of the World Meteorological Organisation's (WMO) Global Atmosphere Watch (GAW) programme." />
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  <attribute name="ebas_originator" value="&quot;Callaghan, Anna, abc541@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, WACL, Heslington, YO10 5DD, York, UK&quot;, &quot;Nelson, Beth, beth.nelson@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, Innovation Way, Heslington, YO10 5DQ, York, United Kingdom&quot;" />
  <attribute name="ebas_submitter" value="&quot;Callaghan, Anna, abc541@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, WACL, Heslington, YO10 5DD, York, UK&quot;, &quot;Wegener, Robert, r.wegener@fz-juelich.de, Forschungszentrum Jülich GmbH, FZJ, Institut for Energy and Climate Research IEK8 Troposphere, , , 52425, Jülich, Germany&quot;, &quot;Nelson, Beth, beth.nelson@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, Innovation Way, Heslington, YO10 5DQ, York, United Kingdom&quot;" />
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    <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" />
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    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
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    <attribute name="ebas_version" value="1" />
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    <attribute name="ebas_statistics" value="arithmetic mean" />
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    <attribute name="ebas_platform_code" value="CV0001S" />
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    <attribute name="ebas_zero_negative_values" value="Zero and neg. values may appear due to statistical variations at very low concentrations" />
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    <attribute name="_FillValue" type="double" value="NaN" />
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    <attribute name="cell_methods" value="time: detection limit" />
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    <attribute name="ebas_version_description" value="initial revision, manually inspected" />
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    <attribute name="ebas_station_gaw_type" value="G" />
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    <attribute name="ebas_regime" value="IMG" />
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    <attribute name="ebas_instrument_model" value="BLC+Custom" />
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    <attribute name="ebas_zero_negative_values" value="Zero and neg. values may appear due to statistical variations at very low concentrations" />
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    <attribute name="actris_matrix_preferred_term" value="gas phase" />
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    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
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    <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" />
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    <attribute name="cell_methods" value="time: expanded uncertainty 2sigma" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
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    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision, manually inspected" />
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    <attribute name="ebas_data_level" value="3a" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="5mn" />
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    <attribute name="ebas_platform_code" value="CV0001S" />
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    <attribute name="ebas_station_gaw_name" value="Cape Verde Observatory" />
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    <attribute name="ebas_station_gaw_type" value="G" />
    <attribute name="ebas_station_wmo_region" type="long" value="1" />
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    <attribute name="ebas_instrument_model" value="BLC+Custom" />
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    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
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    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mass_concentration_of_nox_expressed_as_nitrogen_in_air" />
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    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
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    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mole_fraction_of_nox_in_air" />
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    <attribute name="ebas_orig_time_res" value="5mn" />
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    <attribute name="ebas_station_gaw_type" value="G" />
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    <attribute name="ebas_station_latitude" type="double" value="16.86403" />
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    <attribute name="ebas_station_altitude" value="10.0 m" />
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    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="NOx" />
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    <attribute name="ebas_instrument_name" value="CVO_AQD_Nox" />
    <attribute name="ebas_instrument_manufacturer" value="airqualitydesign+airqualitydesign" />
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    <attribute name="ebas_zero_negative_values" value="Zero and neg. values may appear due to statistical variations at very low concentrations" />
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    <attribute name="actris_variable_preferred_term" value="nitrogen oxides mass concentration" />
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    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
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  <variable name="v_NOx_nmol_per_mol_precision" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
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    <attribute name="units" value="nmol/mol" />
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    <attribute name="cell_methods" value="time: precision" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
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    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision, manually inspected" />
    <attribute name="ebas_statistics" value="precision" />
    <attribute name="ebas_data_level" value="3a" />
    <attribute name="ebas_sample_duration" value="1h" />
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    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="NOx" />
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    <attribute name="ebas_instrument_name" value="CVO_AQD_Nox" />
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    <attribute name="ebas_zero_negative_values" value="Zero and neg. values may appear due to statistical variations at very low concentrations" />
    <attribute name="ebas_organization" value="GB12L, National Centre for Atmospheric Science, NCAS, , Department of Chemistry, University of York, YO10 5DD, York, United Kingdom" />
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    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
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    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mass_concentration_of_nox_expressed_as_nitrogen_in_air" />
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    <attribute name="ancillary_variables" value="qc_NOx_ug_N_per_m3_precision meta_NOx_ug_N_per_m3_precision" />
    <attribute name="cell_methods" value="time: precision" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
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    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision, manually inspected" />
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    <attribute name="ebas_orig_time_res" value="5mn" />
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    <attribute name="ebas_station_gaw_type" value="G" />
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    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="NOx" />
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    <attribute name="ebas_instrument_manufacturer" value="airqualitydesign+airqualitydesign" />
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    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
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    <attribute name="_FillValue" type="double" value="NaN" />
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    <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="2025-06-13T14:53:59.077126Z" />
    <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="3a" />
    <attribute name="ebas_sample_duration" value="1h" />
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    <attribute name="ebas_station_gaw_type" value="G" />
    <attribute name="ebas_station_wmo_region" type="long" value="1" />
    <attribute name="ebas_station_latitude" type="double" value="16.86403" />
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    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="NOx" />
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    <attribute name="ebas_instrument_name" value="CVO_AQD_Nox" />
    <attribute name="ebas_instrument_manufacturer" value="airqualitydesign+airqualitydesign" />
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    <attribute name="ebas_zero_negative_values_code" value="Zero/negative possible" />
    <attribute name="ebas_zero_negative_values" value="Zero and neg. values may appear due to statistical variations at very low concentrations" />
    <attribute name="ebas_organization" value="GB12L, National Centre for Atmospheric Science, NCAS, , Department of Chemistry, University of York, YO10 5DD, York, United Kingdom" />
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    <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre, Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="clm@nilu.no, kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Callaghan, Anna, abc541@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, WACL, Heslington, YO10 5DD, York, UK&quot;, &quot;Nelson, Beth, beth.nelson@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, Innovation Way, Heslington, YO10 5DQ, York, United Kingdom&quot;" />
    <attribute name="ebas_submitter" value="&quot;Callaghan, Anna, abc541@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, WACL, Heslington, YO10 5DD, York, UK&quot;, &quot;Wegener, Robert, r.wegener@fz-juelich.de, Forschungszentrum Jülich GmbH, FZJ, Institut for Energy and Climate Research IEK8 Troposphere, , , 52425, Jülich, Germany&quot;, &quot;Nelson, Beth, beth.nelson@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, Innovation Way, Heslington, YO10 5DQ, York, United Kingdom&quot;" />
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    <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" />
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    <attribute name="actris_matrix_preferred_term" value="gas phase" />
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    <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="https://vocabulary.actris.nilu.no/actris_controlled_lists/ACTRIS, https://vocabulary.actris.nilu.no/actris_controlled_lists/GAW-WDCRG" />
    <attribute name="actris_framework_preferred_term" value="ACTRIS, GAW-WDCRG" />
    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
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  <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" />
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  <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="2025-06-13T14:53:59.077126Z" />
    <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="3a" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="5mn" />
    <attribute name="ebas_station_code" value="CV0001G" />
    <attribute name="ebas_platform_code" value="CV0001S" />
    <attribute name="ebas_station_name" value="Cape Verde Atmospheric Observatory" />
    <attribute name="ebas_station_gaw_id" value="CVO" />
    <attribute name="ebas_station_gaw_name" value="Cape Verde Observatory" />
    <attribute name="ebas_station_land_use" value="Gravel and stone" />
    <attribute name="ebas_station_setting" value="Coastal" />
    <attribute name="ebas_station_gaw_type" value="G" />
    <attribute name="ebas_station_wmo_region" type="long" value="1" />
    <attribute name="ebas_station_latitude" type="double" value="16.86403" />
    <attribute name="ebas_station_longitude" type="double" value="-24.86752" />
    <attribute name="ebas_station_altitude" value="10.0 m" />
    <attribute name="ebas_measurement_height" value="7.5 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="GB12L" />
    <attribute name="ebas_instrument_type" value="chemiluminescence_photolytic" />
    <attribute name="ebas_instrument_name" value="CVO_AQD_Nox" />
    <attribute name="ebas_instrument_manufacturer" value="airqualitydesign+airqualitydesign" />
    <attribute name="ebas_instrument_model" value="BLC+Custom" />
    <attribute name="ebas_instrument_serial_number" value="305400-Noxy" />
    <attribute name="ebas_method_ref" value="DE20L_NOx_corr_O3_H2O" />
    <attribute name="ebas_standard_method" value="SOP=ACTRIS_NOxy_2014" />
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    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Dark. Downward facing inlet with hood" />
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    <attribute name="ebas_water_vapor_correction" value="Not applicable as calibrated at ambient humidity" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="Passive, inlet air heated from atmospheric to converter temperature" />
    <attribute name="ebas_volume_std_temperature" value="273.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
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    <attribute name="ebas_zero_negative_values_code" value="Zero/negative possible" />
    <attribute name="ebas_zero_negative_values" value="Zero and neg. values may appear due to statistical variations at very low concentrations" />
    <attribute name="ebas_organization" value="GB12L, National Centre for Atmospheric Science, NCAS, , Department of Chemistry, University of York, YO10 5DD, York, United Kingdom" />
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    <attribute name="ebas_framework_name" value="&quot;European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases&quot;, World Data Centre for Reactive Gases" />
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    <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 frameworks: ACTRIS, GAW-WDCRG. In the event of publications using this data the author must contact the Atmospheric Measurement Facility (AMF), National Centre for Atmospheric Science (NCAS)" />
    <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" />
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    <attribute name="actris_matrix_preferred_term" value="gas phase" />
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    <attribute name="actris_constraints_preferred_term" value="expressed as nitrogen" />
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    <attribute name="actris_timeliness_preferred_term" value="scheduled" />
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    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
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    <attribute name="standard_name" value="status_flag" />
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    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
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    <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/" />
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    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision, manually inspected" />
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    <attribute name="ebas_orig_time_res" value="5mn" />
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    <attribute name="ebas_station_setting" value="Coastal" />
    <attribute name="ebas_station_gaw_type" value="G" />
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    <attribute name="ebas_station_latitude" type="double" value="16.86403" />
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    <attribute name="ebas_station_altitude" value="10.0 m" />
    <attribute name="ebas_measurement_height" value="7.5 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" />
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    <attribute name="ebas_instrument_name" value="CVO_AQD_Nox" />
    <attribute name="ebas_instrument_manufacturer" value="airqualitydesign+airqualitydesign" />
    <attribute name="ebas_instrument_model" value="BLC+Custom" />
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    <attribute name="ebas_zero_negative_values" value="Zero and neg. values may appear due to statistical variations at very low concentrations" />
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    <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" />
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    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
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    <attribute name="_FillValue" type="int" value="0" />
    <attribute name="standard_name" value="status_flag" />
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    <attribute name="units" value="1" />
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  <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="2025-06-13T14:53:59.077126Z" />
    <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="3a" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="5mn" />
    <attribute name="ebas_station_code" value="CV0001G" />
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    <attribute name="ebas_station_gaw_type" value="G" />
    <attribute name="ebas_station_wmo_region" type="long" value="1" />
    <attribute name="ebas_station_latitude" type="double" value="16.86403" />
    <attribute name="ebas_station_longitude" type="double" value="-24.86752" />
    <attribute name="ebas_station_altitude" value="10.0 m" />
    <attribute name="ebas_measurement_height" value="7.5 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="GB12L" />
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    <attribute name="ebas_instrument_name" value="CVO_AQD_Nox" />
    <attribute name="ebas_instrument_manufacturer" value="airqualitydesign+airqualitydesign" />
    <attribute name="ebas_instrument_model" value="BLC+Custom" />
    <attribute name="ebas_instrument_serial_number" value="305400-Noxy" />
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    <attribute name="ebas_inlet_description" value="Dark. Downward facing inlet with hood" />
    <attribute name="ebas_inlet_tube_material" value="Teflon" />
    <attribute name="ebas_ozone_correction" value="Corrected for reaction with O3 in the inlet" />
    <attribute name="ebas_water_vapor_correction" value="Not applicable as calibrated at ambient humidity" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="Passive, inlet air heated from atmospheric to converter 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="2sigma standard deviation of the 5min zero variability" />
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    <attribute name="ebas_zero_negative_values_code" value="Zero/negative possible" />
    <attribute name="ebas_zero_negative_values" value="Zero and neg. values may appear due to statistical variations at very low concentrations" />
    <attribute name="ebas_organization" value="GB12L, National Centre for Atmospheric Science, NCAS, , Department of Chemistry, University of York, YO10 5DD, York, United Kingdom" />
    <attribute name="ebas_framework_acronym" value="ACTRIS, GAW-WDCRG" />
    <attribute name="ebas_framework_name" value="&quot;European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases&quot;, World Data Centre for Reactive Gases" />
    <attribute name="ebas_framework_description" value="&quot;ACTRIS is the European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases. ACTRIS is composed of observing stations, exploratory platforms, instruments calibration centres, and a data centre.&quot;, The World Data Centre for Reactive Gases is the data repository and archive for reactive gases of the World Meteorological Organisation's (WMO) Global Atmosphere Watch (GAW) programme." />
    <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre, Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="clm@nilu.no, kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Callaghan, Anna, abc541@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, WACL, Heslington, YO10 5DD, York, UK&quot;, &quot;Nelson, Beth, beth.nelson@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, Innovation Way, Heslington, YO10 5DQ, York, United Kingdom&quot;" />
    <attribute name="ebas_submitter" value="&quot;Callaghan, Anna, abc541@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, WACL, Heslington, YO10 5DD, York, UK&quot;, &quot;Wegener, Robert, r.wegener@fz-juelich.de, Forschungszentrum Jülich GmbH, FZJ, Institut for Energy and Climate Research IEK8 Troposphere, , , 52425, Jülich, Germany&quot;, &quot;Nelson, Beth, beth.nelson@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, Innovation Way, Heslington, YO10 5DQ, York, United Kingdom&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 frameworks: ACTRIS, GAW-WDCRG. In the event of publications using this data the author must contact the Atmospheric Measurement Facility (AMF), National Centre for Atmospheric Science (NCAS)" />
    <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="https://vocabulary.actris.nilu.no/actris_controlled_lists/ACTRIS, https://vocabulary.actris.nilu.no/actris_controlled_lists/GAW-WDCRG" />
    <attribute name="actris_framework_preferred_term" value="ACTRIS, GAW-WDCRG" />
    <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_det_lim" 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_det_lim meta_nitrogen_dioxide_nmol_per_mol_det_lim" />
    <attribute name="cell_methods" value="time: detection limit" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2025-06-13T14:53:59.077126Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision, manually inspected" />
    <attribute name="ebas_statistics" value="detection limit" />
    <attribute name="ebas_data_level" value="3a" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="5mn" />
    <attribute name="ebas_station_code" value="CV0001G" />
    <attribute name="ebas_platform_code" value="CV0001S" />
    <attribute name="ebas_station_name" value="Cape Verde Atmospheric Observatory" />
    <attribute name="ebas_station_gaw_id" value="CVO" />
    <attribute name="ebas_station_gaw_name" value="Cape Verde Observatory" />
    <attribute name="ebas_station_land_use" value="Gravel and stone" />
    <attribute name="ebas_station_setting" value="Coastal" />
    <attribute name="ebas_station_gaw_type" value="G" />
    <attribute name="ebas_station_wmo_region" type="long" value="1" />
    <attribute name="ebas_station_latitude" type="double" value="16.86403" />
    <attribute name="ebas_station_longitude" type="double" value="-24.86752" />
    <attribute name="ebas_station_altitude" value="10.0 m" />
    <attribute name="ebas_measurement_height" value="7.5 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="GB12L" />
    <attribute name="ebas_instrument_type" value="chemiluminescence_photolytic" />
    <attribute name="ebas_instrument_name" value="CVO_AQD_Nox" />
    <attribute name="ebas_instrument_manufacturer" value="airqualitydesign+airqualitydesign" />
    <attribute name="ebas_instrument_model" value="BLC+Custom" />
    <attribute name="ebas_instrument_serial_number" value="305400-Noxy" />
    <attribute name="ebas_method_ref" value="DE20L_NOx_corr_O3_H2O" />
    <attribute name="ebas_standard_method" value="SOP=ACTRIS_NOxy_2014" />
    <attribute name="ebas_calibration_standard_id" value="Manufacturer: BOC, Cylinder code: 21901520021714" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Dark. Downward facing inlet with hood" />
    <attribute name="ebas_inlet_tube_material" value="Teflon" />
    <attribute name="ebas_ozone_correction" value="Corrected for reaction with O3 in the inlet" />
    <attribute name="ebas_water_vapor_correction" value="Not applicable as calibrated at ambient humidity" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="Passive, inlet air heated from atmospheric to converter temperature" />
    <attribute name="ebas_detection_limit_expl" value="2sigma standard deviation of the 5min zero variability" />
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    <attribute name="ebas_zero_negative_values_code" value="Zero/negative possible" />
    <attribute name="ebas_zero_negative_values" value="Zero and neg. values may appear due to statistical variations at very low concentrations" />
    <attribute name="ebas_organization" value="GB12L, National Centre for Atmospheric Science, NCAS, , Department of Chemistry, University of York, YO10 5DD, York, United Kingdom" />
    <attribute name="ebas_framework_acronym" value="ACTRIS, GAW-WDCRG" />
    <attribute name="ebas_framework_name" value="&quot;European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases&quot;, World Data Centre for Reactive Gases" />
    <attribute name="ebas_framework_description" value="&quot;ACTRIS is the European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases. ACTRIS is composed of observing stations, exploratory platforms, instruments calibration centres, and a data centre.&quot;, The World Data Centre for Reactive Gases is the data repository and archive for reactive gases of the World Meteorological Organisation's (WMO) Global Atmosphere Watch (GAW) programme." />
    <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre, Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="clm@nilu.no, kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Callaghan, Anna, abc541@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, WACL, Heslington, YO10 5DD, York, UK&quot;, &quot;Nelson, Beth, beth.nelson@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, Innovation Way, Heslington, YO10 5DQ, York, United Kingdom&quot;" />
    <attribute name="ebas_submitter" value="&quot;Callaghan, Anna, abc541@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, WACL, Heslington, YO10 5DD, York, UK&quot;, &quot;Wegener, Robert, r.wegener@fz-juelich.de, Forschungszentrum Jülich GmbH, FZJ, Institut for Energy and Climate Research IEK8 Troposphere, , , 52425, Jülich, Germany&quot;, &quot;Nelson, Beth, beth.nelson@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, Innovation Way, Heslington, YO10 5DQ, York, United Kingdom&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 frameworks: ACTRIS, GAW-WDCRG. In the event of publications using this data the author must contact the Atmospheric Measurement Facility (AMF), National Centre for Atmospheric Science (NCAS)" />
    <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" />
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    <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="https://vocabulary.actris.nilu.no/actris_controlled_lists/ACTRIS, https://vocabulary.actris.nilu.no/actris_controlled_lists/GAW-WDCRG" />
    <attribute name="actris_framework_preferred_term" value="ACTRIS, GAW-WDCRG" />
    <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_det_lim" shape="qc_nitrogen_dioxide_nmol_per_mol_det_lim_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_det_lim" 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_det_lim" 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_det_lim meta_nitrogen_dioxide_ug_N_per_m3_det_lim" />
    <attribute name="cell_methods" value="time: detection limit" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2025-06-13T14:53:59.077126Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision, manually inspected" />
    <attribute name="ebas_statistics" value="detection limit" />
    <attribute name="ebas_data_level" value="3a" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="5mn" />
    <attribute name="ebas_station_code" value="CV0001G" />
    <attribute name="ebas_platform_code" value="CV0001S" />
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    <attribute name="ebas_station_setting" value="Coastal" />
    <attribute name="ebas_station_gaw_type" value="G" />
    <attribute name="ebas_station_wmo_region" type="long" value="1" />
    <attribute name="ebas_station_latitude" type="double" value="16.86403" />
    <attribute name="ebas_station_longitude" type="double" value="-24.86752" />
    <attribute name="ebas_station_altitude" value="10.0 m" />
    <attribute name="ebas_measurement_height" value="7.5 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" />
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    <attribute name="ebas_instrument_name" value="CVO_AQD_Nox" />
    <attribute name="ebas_instrument_manufacturer" value="airqualitydesign+airqualitydesign" />
    <attribute name="ebas_instrument_model" value="BLC+Custom" />
    <attribute name="ebas_instrument_serial_number" value="305400-Noxy" />
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    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Dark. Downward facing inlet with hood" />
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    <attribute name="ebas_water_vapor_correction" value="Not applicable as calibrated at ambient humidity" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
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    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
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    <attribute name="ebas_zero_negative_values_code" value="Zero/negative possible" />
    <attribute name="ebas_zero_negative_values" value="Zero and neg. values may appear due to statistical variations at very low concentrations" />
    <attribute name="ebas_organization" value="GB12L, National Centre for Atmospheric Science, NCAS, , Department of Chemistry, University of York, YO10 5DD, York, United Kingdom" />
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    <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre, Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="clm@nilu.no, kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Callaghan, Anna, abc541@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, WACL, Heslington, YO10 5DD, York, UK&quot;, &quot;Nelson, Beth, beth.nelson@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, Innovation Way, Heslington, YO10 5DQ, York, United Kingdom&quot;" />
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    <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 frameworks: ACTRIS, GAW-WDCRG. In the event of publications using this data the author must contact the Atmospheric Measurement Facility (AMF), National Centre for Atmospheric Science (NCAS)" />
    <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" />
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    <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" />
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    <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="https://vocabulary.actris.nilu.no/actris_controlled_lists/ACTRIS, https://vocabulary.actris.nilu.no/actris_controlled_lists/GAW-WDCRG" />
    <attribute name="actris_framework_preferred_term" value="ACTRIS, GAW-WDCRG" />
    <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_det_lim" shape="qc_nitrogen_dioxide_ug_N_per_m3_det_lim_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_det_lim" 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_ExpUnc2s" 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_ExpUnc2s meta_nitrogen_dioxide_nmol_per_mol_ExpUnc2s" />
    <attribute name="cell_methods" value="time: expanded uncertainty 2sigma" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2025-06-13T14:53:59.077126Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision, manually inspected" />
    <attribute name="ebas_statistics" value="expanded uncertainty 2sigma" />
    <attribute name="ebas_data_level" value="3a" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="5mn" />
    <attribute name="ebas_station_code" value="CV0001G" />
    <attribute name="ebas_platform_code" value="CV0001S" />
    <attribute name="ebas_station_name" value="Cape Verde Atmospheric Observatory" />
    <attribute name="ebas_station_gaw_id" value="CVO" />
    <attribute name="ebas_station_gaw_name" value="Cape Verde Observatory" />
    <attribute name="ebas_station_land_use" value="Gravel and stone" />
    <attribute name="ebas_station_setting" value="Coastal" />
    <attribute name="ebas_station_gaw_type" value="G" />
    <attribute name="ebas_station_wmo_region" type="long" value="1" />
    <attribute name="ebas_station_latitude" type="double" value="16.86403" />
    <attribute name="ebas_station_longitude" type="double" value="-24.86752" />
    <attribute name="ebas_station_altitude" value="10.0 m" />
    <attribute name="ebas_measurement_height" value="7.5 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="GB12L" />
    <attribute name="ebas_instrument_type" value="chemiluminescence_photolytic" />
    <attribute name="ebas_instrument_name" value="CVO_AQD_Nox" />
    <attribute name="ebas_instrument_manufacturer" value="airqualitydesign+airqualitydesign" />
    <attribute name="ebas_instrument_model" value="BLC+Custom" />
    <attribute name="ebas_instrument_serial_number" value="305400-Noxy" />
    <attribute name="ebas_method_ref" value="DE20L_NOx_corr_O3_H2O" />
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    <attribute name="ebas_inlet_description" value="Dark. Downward facing inlet with hood" />
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    <attribute name="ebas_ozone_correction" value="Corrected for reaction with O3 in the inlet" />
    <attribute name="ebas_water_vapor_correction" value="Not applicable as calibrated at ambient humidity" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="Passive, inlet air heated from atmospheric to converter temperature" />
    <attribute name="ebas_detection_limit_expl" value="2sigma standard deviation of the 5min zero variability" />
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    <attribute name="ebas_zero_negative_values_code" value="Zero/negative possible" />
    <attribute name="ebas_zero_negative_values" value="Zero and neg. values may appear due to statistical variations at very low concentrations" />
    <attribute name="ebas_organization" value="GB12L, National Centre for Atmospheric Science, NCAS, , Department of Chemistry, University of York, YO10 5DD, York, United Kingdom" />
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    <attribute name="ebas_framework_name" value="&quot;European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases&quot;, World Data Centre for Reactive Gases" />
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    <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre, Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="clm@nilu.no, kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Callaghan, Anna, abc541@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, WACL, Heslington, YO10 5DD, York, UK&quot;, &quot;Nelson, Beth, beth.nelson@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, Innovation Way, Heslington, YO10 5DQ, York, United Kingdom&quot;" />
    <attribute name="ebas_submitter" value="&quot;Callaghan, Anna, abc541@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, WACL, Heslington, YO10 5DD, York, UK&quot;, &quot;Wegener, Robert, r.wegener@fz-juelich.de, Forschungszentrum Jülich GmbH, FZJ, Institut for Energy and Climate Research IEK8 Troposphere, , , 52425, Jülich, Germany&quot;, &quot;Nelson, Beth, beth.nelson@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, Innovation Way, Heslington, YO10 5DQ, York, United Kingdom&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 frameworks: ACTRIS, GAW-WDCRG. In the event of publications using this data the author must contact the Atmospheric Measurement Facility (AMF), National Centre for Atmospheric Science (NCAS)" />
    <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" />
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    <attribute name="actris_matrix_preferred_term" value="gas phase" />
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    <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="https://vocabulary.actris.nilu.no/actris_controlled_lists/ACTRIS, https://vocabulary.actris.nilu.no/actris_controlled_lists/GAW-WDCRG" />
    <attribute name="actris_framework_preferred_term" value="ACTRIS, GAW-WDCRG" />
    <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_ExpUnc2s" shape="qc_nitrogen_dioxide_nmol_per_mol_ExpUnc2s_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" />
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  <variable name="meta_nitrogen_dioxide_nmol_per_mol_ExpUnc2s" 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_ExpUnc2s" 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_ExpUnc2s meta_nitrogen_dioxide_ug_N_per_m3_ExpUnc2s" />
    <attribute name="cell_methods" value="time: expanded uncertainty 2sigma" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2025-06-13T14:53:59.077126Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision, manually inspected" />
    <attribute name="ebas_statistics" value="expanded uncertainty 2sigma" />
    <attribute name="ebas_data_level" value="3a" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="5mn" />
    <attribute name="ebas_station_code" value="CV0001G" />
    <attribute name="ebas_platform_code" value="CV0001S" />
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    <attribute name="ebas_station_gaw_id" value="CVO" />
    <attribute name="ebas_station_gaw_name" value="Cape Verde Observatory" />
    <attribute name="ebas_station_land_use" value="Gravel and stone" />
    <attribute name="ebas_station_setting" value="Coastal" />
    <attribute name="ebas_station_gaw_type" value="G" />
    <attribute name="ebas_station_wmo_region" type="long" value="1" />
    <attribute name="ebas_station_latitude" type="double" value="16.86403" />
    <attribute name="ebas_station_longitude" type="double" value="-24.86752" />
    <attribute name="ebas_station_altitude" value="10.0 m" />
    <attribute name="ebas_measurement_height" value="7.5 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" />
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    <attribute name="ebas_instrument_type" value="chemiluminescence_photolytic" />
    <attribute name="ebas_instrument_name" value="CVO_AQD_Nox" />
    <attribute name="ebas_instrument_manufacturer" value="airqualitydesign+airqualitydesign" />
    <attribute name="ebas_instrument_model" value="BLC+Custom" />
    <attribute name="ebas_instrument_serial_number" value="305400-Noxy" />
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    <attribute name="ebas_inlet_description" value="Dark. Downward facing inlet with hood" />
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    <attribute name="ebas_water_vapor_correction" value="Not applicable as calibrated at ambient humidity" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="Passive, inlet air heated from atmospheric to converter temperature" />
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    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
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    <attribute name="ebas_zero_negative_values_code" value="Zero/negative possible" />
    <attribute name="ebas_zero_negative_values" value="Zero and neg. values may appear due to statistical variations at very low concentrations" />
    <attribute name="ebas_organization" value="GB12L, National Centre for Atmospheric Science, NCAS, , Department of Chemistry, University of York, YO10 5DD, York, United Kingdom" />
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    <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 frameworks: ACTRIS, GAW-WDCRG. In the event of publications using this data the author must contact the Atmospheric Measurement Facility (AMF), National Centre for Atmospheric Science (NCAS)" />
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    <attribute name="actris_variable_preferred_term" value="nitrogen dioxide mass concentration" />
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    <attribute name="actris_matrix_preferred_term" value="gas phase" />
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    <attribute name="actris_constraints_preferred_term" value="expressed as nitrogen" />
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    <attribute name="actris_timeliness_preferred_term" value="scheduled" />
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    <attribute name="actris_access_restriction" type="long" value="0" />
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  <variable name="qc_nitrogen_dioxide_ug_N_per_m3_ExpUnc2s" shape="qc_nitrogen_dioxide_ug_N_per_m3_ExpUnc2s_flags time" type="int">
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    <attribute name="missing_value" type="int" value="0" />
    <attribute name="units" value="1" />
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  <variable name="meta_nitrogen_dioxide_ug_N_per_m3_ExpUnc2s" shape="metadata_time" type="String">
    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
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    <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_prec1587 meta_nitrogen_dioxide_nmol_per_mol_prec1587" />
    <attribute name="cell_methods" value="time: percentile:15.87" />
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    <attribute name="ebas_orig_time_res" value="5mn" />
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    <attribute name="ebas_station_gaw_type" value="G" />
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    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="nitrogen_dioxide" />
    <attribute name="ebas_unit" value="nmol/mol" />
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    <attribute name="ebas_instrument_name" value="CVO_AQD_Nox" />
    <attribute name="ebas_instrument_manufacturer" value="airqualitydesign+airqualitydesign" />
    <attribute name="ebas_instrument_model" value="BLC+Custom" />
    <attribute name="ebas_instrument_serial_number" value="305400-Noxy" />
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    <attribute name="actris_variable_preferred_term" value="nitrogen dioxide amount fraction" />
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    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
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  <variable name="qc_nitrogen_dioxide_nmol_per_mol_prec1587" shape="qc_nitrogen_dioxide_nmol_per_mol_prec1587_flags time" type="int">
    <attribute name="_FillValue" type="int" value="0" />
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    <attribute name="units" value="1" />
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  <variable name="meta_nitrogen_dioxide_nmol_per_mol_prec1587" 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_prec1587" 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_prec1587 meta_nitrogen_dioxide_ug_N_per_m3_prec1587" />
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    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2025-06-13T14:53:59.077126Z" />
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    <attribute name="ebas_version_description" value="initial revision, manually inspected" />
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    <attribute name="ebas_data_level" value="3a" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="5mn" />
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    <attribute name="ebas_station_gaw_name" value="Cape Verde Observatory" />
    <attribute name="ebas_station_land_use" value="Gravel and stone" />
    <attribute name="ebas_station_setting" value="Coastal" />
    <attribute name="ebas_station_gaw_type" value="G" />
    <attribute name="ebas_station_wmo_region" type="long" value="1" />
    <attribute name="ebas_station_latitude" type="double" value="16.86403" />
    <attribute name="ebas_station_longitude" type="double" value="-24.86752" />
    <attribute name="ebas_station_altitude" value="10.0 m" />
    <attribute name="ebas_measurement_height" value="7.5 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" />
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    <attribute name="ebas_instrument_name" value="CVO_AQD_Nox" />
    <attribute name="ebas_instrument_manufacturer" value="airqualitydesign+airqualitydesign" />
    <attribute name="ebas_instrument_model" value="BLC+Custom" />
    <attribute name="ebas_instrument_serial_number" value="305400-Noxy" />
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    <attribute name="ebas_standard_method" value="SOP=ACTRIS_NOxy_2014" />
    <attribute name="ebas_calibration_standard_id" value="Manufacturer: BOC, Cylinder code: 21901520021714" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Dark. Downward facing inlet with hood" />
    <attribute name="ebas_inlet_tube_material" value="Teflon" />
    <attribute name="ebas_ozone_correction" value="Corrected for reaction with O3 in the inlet" />
    <attribute name="ebas_water_vapor_correction" value="Not applicable as calibrated at ambient humidity" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="Passive, inlet air heated from atmospheric to converter 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="2sigma standard deviation of the 5min zero variability" />
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    <attribute name="ebas_zero_negative_values_code" value="Zero/negative possible" />
    <attribute name="ebas_zero_negative_values" value="Zero and neg. values may appear due to statistical variations at very low concentrations" />
    <attribute name="ebas_organization" value="GB12L, National Centre for Atmospheric Science, NCAS, , Department of Chemistry, University of York, YO10 5DD, York, United Kingdom" />
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    <attribute name="ebas_framework_name" value="&quot;European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases&quot;, World Data Centre for Reactive Gases" />
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    <attribute name="ebas_originator" value="&quot;Callaghan, Anna, abc541@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, WACL, Heslington, YO10 5DD, York, UK&quot;, &quot;Nelson, Beth, beth.nelson@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, Innovation Way, Heslington, YO10 5DQ, York, United Kingdom&quot;" />
    <attribute name="ebas_submitter" value="&quot;Callaghan, Anna, abc541@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, WACL, Heslington, YO10 5DD, York, UK&quot;, &quot;Wegener, Robert, r.wegener@fz-juelich.de, Forschungszentrum Jülich GmbH, FZJ, Institut for Energy and Climate Research IEK8 Troposphere, , , 52425, Jülich, Germany&quot;, &quot;Nelson, Beth, beth.nelson@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, Innovation Way, Heslington, YO10 5DQ, York, United Kingdom&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 frameworks: ACTRIS, GAW-WDCRG. In the event of publications using this data the author must contact the Atmospheric Measurement Facility (AMF), National Centre for Atmospheric Science (NCAS)" />
    <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" />
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    <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="https://vocabulary.actris.nilu.no/actris_controlled_lists/ACTRIS, https://vocabulary.actris.nilu.no/actris_controlled_lists/GAW-WDCRG" />
    <attribute name="actris_framework_preferred_term" value="ACTRIS, GAW-WDCRG" />
    <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_prec1587" shape="qc_nitrogen_dioxide_ug_N_per_m3_prec1587_flags time" type="int">
    <attribute name="missing_value" type="int" value="0" />
    <attribute name="units" value="1" />
    <attribute name="_FillValue" type="int" value="0" />
    <attribute name="standard_name" value="status_flag" />
  </variable>
  <variable name="meta_nitrogen_dioxide_ug_N_per_m3_prec1587" 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_perc8413" 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_perc8413 meta_nitrogen_dioxide_nmol_per_mol_perc8413" />
    <attribute name="cell_methods" value="time: percentile:84.13" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
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    <attribute name="ebas_data_level" value="3a" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="5mn" />
    <attribute name="ebas_station_code" value="CV0001G" />
    <attribute name="ebas_platform_code" value="CV0001S" />
    <attribute name="ebas_station_name" value="Cape Verde Atmospheric Observatory" />
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    <attribute name="ebas_station_gaw_name" value="Cape Verde Observatory" />
    <attribute name="ebas_station_land_use" value="Gravel and stone" />
    <attribute name="ebas_station_setting" value="Coastal" />
    <attribute name="ebas_station_gaw_type" value="G" />
    <attribute name="ebas_station_wmo_region" type="long" value="1" />
    <attribute name="ebas_station_latitude" type="double" value="16.86403" />
    <attribute name="ebas_station_longitude" type="double" value="-24.86752" />
    <attribute name="ebas_station_altitude" value="10.0 m" />
    <attribute name="ebas_measurement_height" value="7.5 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" />
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    <attribute name="ebas_instrument_name" value="CVO_AQD_Nox" />
    <attribute name="ebas_instrument_manufacturer" value="airqualitydesign+airqualitydesign" />
    <attribute name="ebas_instrument_model" value="BLC+Custom" />
    <attribute name="ebas_instrument_serial_number" value="305400-Noxy" />
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    <attribute name="ebas_inlet_description" value="Dark. Downward facing inlet with hood" />
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    <attribute name="ebas_water_vapor_correction" value="Not applicable as calibrated at ambient humidity" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="Passive, inlet air heated from atmospheric to converter temperature" />
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    <attribute name="ebas_zero_negative_values_code" value="Zero/negative possible" />
    <attribute name="ebas_zero_negative_values" value="Zero and neg. values may appear due to statistical variations at very low concentrations" />
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    <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" />
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    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
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  <variable name="qc_nitrogen_dioxide_nmol_per_mol_perc8413" shape="qc_nitrogen_dioxide_nmol_per_mol_perc8413_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" />
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  <variable name="meta_nitrogen_dioxide_nmol_per_mol_perc8413" 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_perc8413" 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_perc8413 meta_nitrogen_dioxide_ug_N_per_m3_perc8413" />
    <attribute name="cell_methods" value="time: percentile:84.13" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2025-06-13T14:53:59.077126Z" />
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    <attribute name="ebas_version_description" value="initial revision, manually inspected" />
    <attribute name="ebas_statistics" value="percentile:84.13" />
    <attribute name="ebas_data_level" value="3a" />
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    <attribute name="ebas_orig_time_res" value="5mn" />
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    <attribute name="ebas_station_setting" value="Coastal" />
    <attribute name="ebas_station_gaw_type" value="G" />
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    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="nitrogen_dioxide" />
    <attribute name="ebas_unit" value="ug N/m3" />
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    <attribute name="ebas_instrument_name" value="CVO_AQD_Nox" />
    <attribute name="ebas_instrument_manufacturer" value="airqualitydesign+airqualitydesign" />
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    <attribute name="ebas_zero_negative_values" value="Zero and neg. values may appear due to statistical variations at very low concentrations" />
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    <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 frameworks: ACTRIS, GAW-WDCRG. In the event of publications using this data the author must contact the Atmospheric Measurement Facility (AMF), National Centre for Atmospheric Science (NCAS)" />
    <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" />
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    <attribute name="actris_matrix_preferred_term" value="gas phase" />
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    <attribute name="actris_constraints_preferred_term" value="expressed as nitrogen" />
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    <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" />
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    <attribute name="actris_framework_preferred_term" value="ACTRIS, GAW-WDCRG" />
    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
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  <variable name="qc_nitrogen_dioxide_ug_N_per_m3_perc8413" shape="qc_nitrogen_dioxide_ug_N_per_m3_perc8413_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" />
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  <variable name="meta_nitrogen_dioxide_ug_N_per_m3_perc8413" 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_precision" 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_precision meta_nitrogen_dioxide_nmol_per_mol_precision" />
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    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
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    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
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    <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" />
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    <attribute name="missing_value" type="double" value="NaN" />
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    <attribute name="standard_name" value="mass_concentration_of_nitrogen_monoxide_expressed_as_nitrogen_in_air" />
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    <attribute name="ebas_water_vapor_correction" value="Not applicable as calibrated at ambient humidity" />
    <attribute name="ebas_humidity_temperaure_control" value="None" />
    <attribute name="ebas_humidity_temperaure_control_description" value="Passive, inlet air heated from atmospheric to converter 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="2sigma standard deviation of the 5min zero variability" />
    <attribute name="ebas_measurement_uncertainty_expl" value="Includes statistical uncertainty of individual sample and calibration uncertainty" />
    <attribute name="ebas_zero_negative_values_code" value="Zero/negative possible" />
    <attribute name="ebas_zero_negative_values" value="Zero and neg. values may appear due to statistical variations at very low concentrations" />
    <attribute name="ebas_organization" value="GB12L, National Centre for Atmospheric Science, NCAS, , Department of Chemistry, University of York, YO10 5DD, York, United Kingdom" />
    <attribute name="ebas_framework_acronym" value="ACTRIS, GAW-WDCRG" />
    <attribute name="ebas_framework_name" value="&quot;European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases&quot;, World Data Centre for Reactive Gases" />
    <attribute name="ebas_framework_description" value="&quot;ACTRIS is the European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases. ACTRIS is composed of observing stations, exploratory platforms, instruments calibration centres, and a data centre.&quot;, The World Data Centre for Reactive Gases is the data repository and archive for reactive gases of the World Meteorological Organisation's (WMO) Global Atmosphere Watch (GAW) programme." />
    <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre, Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="clm@nilu.no, kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Callaghan, Anna, abc541@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, WACL, Heslington, YO10 5DD, York, UK&quot;, &quot;Nelson, Beth, beth.nelson@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, Innovation Way, Heslington, YO10 5DQ, York, United Kingdom&quot;" />
    <attribute name="ebas_submitter" value="&quot;Callaghan, Anna, abc541@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, WACL, Heslington, YO10 5DD, York, UK&quot;, &quot;Wegener, Robert, r.wegener@fz-juelich.de, Forschungszentrum Jülich GmbH, FZJ, Institut for Energy and Climate Research IEK8 Troposphere, , , 52425, Jülich, Germany&quot;, &quot;Nelson, Beth, beth.nelson@york.ac.uk, University of York, UofY, Wolfson Atmospheric Chemistry Laboratory, Innovation Way, Heslington, YO10 5DQ, York, United Kingdom&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 frameworks: ACTRIS, GAW-WDCRG. In the event of publications using this data the author must contact the Atmospheric Measurement Facility (AMF), National Centre for Atmospheric Science (NCAS)" />
    <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="https://vocabulary.actris.nilu.no/actris_controlled_lists/ACTRIS, https://vocabulary.actris.nilu.no/actris_controlled_lists/GAW-WDCRG" />
    <attribute name="actris_framework_preferred_term" value="ACTRIS, GAW-WDCRG" />
    <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>
