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  <attribute name="title" value="Nitrogen oxides at Uccle" />
  <attribute name="summary" value="Nitrogen oxides at Uccle. These measurements are gathered as a part of the following projects CAMPAIGN and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: ['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/G9SE-XTRZ" />
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  <attribute name="citation" value="Amelynck, C., Schoon, N., Verreyken, B., CAMPAIGN, 2025, Nitrogen oxides at Uccle, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/G9SE-XTRZ" />
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  <attribute name="date_created" value="2025-12-18T12:14:57.008313Z" />
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  <attribute name="creator_name" value="Crist Amelynck, Niels Schoon, Bert Verreyken" />
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  <attribute name="contributor_name" value="Crist Amelynck" />
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  <attribute name="publisher_name" value="NILU - Norwegian Institute for Air Research, ATMOS, EBAS" />
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  <dimension name="time" length="720" />
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  <dimension name="qc_nitrogen_monoxide_nmol_per_mol_flags" length="1" />
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    <attribute name="ebas_humidity_temperaure_control" value="None" />
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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_originator" value="&quot;Amelynck, Crist, Crist.Amelynck@aeronomie.be, Royal Belgian Institute for Space Aeronomy, BIRA-IASB, Division of Atmospheric Sources and Sinks, Ringlaan 3, , B-1180, Brussels, Belgium&quot;, &quot;Schoon, Niels, Niels.Schoon@aeronomie.be, Royal Belgian Institute for Space Aeronomy, BIRA-IASB, Division of Atmospheric Sources and Sinks, Ringlaan 3, , B-1180, Brussels, Belgium&quot;, &quot;Verreyken, Bert, Bert.Verreyken@aeronomie.be, Royal Belgian Institute for Space Aeronomy, BIRA-IASB, Division of Atmospheric Sources and Sinks, Ringlaan 3, , B-1180, Brussels, Belgium&quot;" />
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    <attribute name="ebas_comment" value="Data converted on import into EBAS from 'nmol/mol' to 'ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.6249. -- Data converted on export from EBAS from 'ug N/m3' at 273.15 K, 1013.25 hPa to 'nmol/mol', conversion factor 1.600." />
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    <attribute name="ebas_comment" value="Data converted on import into EBAS from 'nmol/mol' to 'ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.6249." />
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    <attribute name="actris_instrument_type_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/chemiluminescencedetector-molybdenumconverter" />
    <attribute name="actris_instrument_type_preferred_term" value="chemiluminescence detector, molybdenum converter" />
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    <attribute name="actris_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="1" />
  </variable>
  <variable name="qc_nitrogen_dioxide_ug_N_per_m3" shape="qc_nitrogen_dioxide_ug_N_per_m3_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" 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" 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 meta_nitrogen_monoxide_nmol_per_mol" />
    <attribute name="cell_methods" value="time: mean" />
    <attribute name="ebas_data_license" value="" />
    <attribute name="ebas_revision_date" value="2025-01-15T00:00:00.000000Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="first revision, manually inspected" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
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    <attribute name="ebas_station_name" value="Uccle" />
    <attribute name="ebas_station_latitude" type="double" value="50.7979" />
    <attribute name="ebas_station_longitude" type="double" value="4.35876" />
    <attribute name="ebas_station_altitude" value="100.0 m" />
    <attribute name="ebas_measurement_height" value="4.3 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="BE09L" />
    <attribute name="ebas_instrument_type" value="chemiluminescence_molybdenum" />
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    <attribute name="ebas_instrument_manufacturer" value="Horiba" />
    <attribute name="ebas_instrument_model" value="APNA-370" />
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    <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_tube_material" value="Teflon" />
    <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_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="BE09L, Royal Belgian Institute for Space Aeronomy, BIRA-IASB, Division of Atmospheric Sources and Sinks, Ringlaan 3, , B-1180, Brussels, Belgium" />
    <attribute name="ebas_framework_acronym" value="CAMPAIGN" />
    <attribute name="ebas_framework_name" value="" />
    <attribute name="ebas_framework_description" value="" />
    <attribute name="ebas_framework_contact_name" value="Wenche Aas" />
    <attribute name="ebas_framework_contact_email" value="waa@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Amelynck, Crist, Crist.Amelynck@aeronomie.be, Royal Belgian Institute for Space Aeronomy, BIRA-IASB, Division of Atmospheric Sources and Sinks, Ringlaan 3, , B-1180, Brussels, Belgium&quot;, &quot;Schoon, Niels, Niels.Schoon@aeronomie.be, Royal Belgian Institute for Space Aeronomy, BIRA-IASB, Division of Atmospheric Sources and Sinks, Ringlaan 3, , B-1180, Brussels, Belgium&quot;, &quot;Verreyken, Bert, Bert.Verreyken@aeronomie.be, Royal Belgian Institute for Space Aeronomy, BIRA-IASB, Division of Atmospheric Sources and Sinks, Ringlaan 3, , B-1180, Brussels, Belgium&quot;" />
    <attribute name="ebas_submitter" value="&quot;Amelynck, Crist, Crist.Amelynck@aeronomie.be, Royal Belgian Institute for Space Aeronomy, BIRA-IASB, Division of Atmospheric Sources and Sinks, Ringlaan 3, , B-1180, Brussels, Belgium&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: CAMPAIGN. For using this data for any kind of publications, you must contact the data originator(s), in terms of acknowledgment" />
    <attribute name="ebas_comment" value="Data converted on import into EBAS from 'nmol/mol' to 'ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.6249. -- Data converted on export from EBAS from 'ug N/m3' at 273.15 K, 1013.25 hPa to 'nmol/mol', conversion factor 1.600." />
    <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" />
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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-molybdenumconverter" />
    <attribute name="actris_instrument_type_preferred_term" value="chemiluminescence detector, molybdenum 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="1" />
  </variable>
  <variable name="qc_nitrogen_monoxide_nmol_per_mol" shape="qc_nitrogen_monoxide_nmol_per_mol_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" 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" 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 meta_nitrogen_monoxide_ug_N_per_m3" />
    <attribute name="cell_methods" value="time: mean" />
    <attribute name="ebas_data_license" value="" />
    <attribute name="ebas_revision_date" value="2025-01-15T00:00:00.000000Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="first revision, manually inspected" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
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    <attribute name="ebas_station_name" value="Uccle" />
    <attribute name="ebas_station_latitude" type="double" value="50.7979" />
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    <attribute name="ebas_station_altitude" value="100.0 m" />
    <attribute name="ebas_measurement_height" value="4.3 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="BE09L" />
    <attribute name="ebas_instrument_type" value="chemiluminescence_molybdenum" />
    <attribute name="ebas_instrument_name" value="NOx_Uccle" />
    <attribute name="ebas_instrument_manufacturer" value="Horiba" />
    <attribute name="ebas_instrument_model" value="APNA-370" />
    <attribute name="ebas_method_ref" value="BE09L_BE0006R_APNA-370_IMP2024" />
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    <attribute name="ebas_inlet_type" value="Hat or hood" />
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    <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_volume_std_temperature" value="273.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
    <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="BE09L, Royal Belgian Institute for Space Aeronomy, BIRA-IASB, Division of Atmospheric Sources and Sinks, Ringlaan 3, , B-1180, Brussels, Belgium" />
    <attribute name="ebas_framework_acronym" value="CAMPAIGN" />
    <attribute name="ebas_framework_name" value="" />
    <attribute name="ebas_framework_description" value="" />
    <attribute name="ebas_framework_contact_name" value="Wenche Aas" />
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    <attribute name="ebas_originator" value="&quot;Amelynck, Crist, Crist.Amelynck@aeronomie.be, Royal Belgian Institute for Space Aeronomy, BIRA-IASB, Division of Atmospheric Sources and Sinks, Ringlaan 3, , B-1180, Brussels, Belgium&quot;, &quot;Schoon, Niels, Niels.Schoon@aeronomie.be, Royal Belgian Institute for Space Aeronomy, BIRA-IASB, Division of Atmospheric Sources and Sinks, Ringlaan 3, , B-1180, Brussels, Belgium&quot;, &quot;Verreyken, Bert, Bert.Verreyken@aeronomie.be, Royal Belgian Institute for Space Aeronomy, BIRA-IASB, Division of Atmospheric Sources and Sinks, Ringlaan 3, , B-1180, Brussels, Belgium&quot;" />
    <attribute name="ebas_submitter" value="&quot;Amelynck, Crist, Crist.Amelynck@aeronomie.be, Royal Belgian Institute for Space Aeronomy, BIRA-IASB, Division of Atmospheric Sources and Sinks, Ringlaan 3, , B-1180, Brussels, Belgium&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: CAMPAIGN. For using this data for any kind of publications, you must contact the data originator(s), in terms of acknowledgment" />
    <attribute name="ebas_comment" value="Data converted on import into EBAS from 'nmol/mol' to 'ug N/m3' at 273.15 K, 1013.25 hPa, conversion factor 0.6249." />
    <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" />
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    <attribute name="actris_constraints_preferred_term" value="expressed as nitrogen" />
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  <variable name="qc_nitrogen_monoxide_ug_N_per_m3" shape="qc_nitrogen_monoxide_ug_N_per_m3_flags time" type="int">
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    <attribute name="standard_name" value="status_flag" />
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    <attribute name="units" value="1" />
  </variable>
  <variable name="meta_nitrogen_monoxide_ug_N_per_m3" 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" />
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    <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" />
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    <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>
