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  <attribute name="featureType" value="timeSeries" />
  <attribute name="title" value="Ozone at Vielsalm" />
  <attribute name="summary" value="Ozone at Vielsalm. These measurements are gathered as a part of the following projects EMEP, GAW-WDCRG and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: ['ozone in air (mole_fraction_of_ozone_in_air)', 'ozone in air (mass_concentration_of_ozone_in_air)']" />
  <attribute name="keywords" value="Vielsalm BE0007R ozone air EMEP GAW-WDCRG mole_fraction_of_ozone_in_air mass_concentration_of_ozone_in_air" />
  <attribute name="id" value="V2MC-PXMC.nc" />
  <attribute name="naming_authority" value="EBAS" />
  <attribute name="project" value="EMEP, GAW-WDCRG" />
  <attribute name="acknowledgement" value="" />
  <attribute name="doi" value="https://doi.org/10.48597/V2MC-PXMC" />
  <attribute name="license" value="https://creativecommons.org/licenses/by/4.0/" />
  <attribute name="citation" value="Bergmans, B., Spanu, L., EMEP, GAW-WDCRG, 2026, Ozone at Vielsalm, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/V2MC-PXMC" />
  <attribute name="source" value="surface observation" />
  <attribute name="institution" value="BE03L &quot;Institut Scientifique de Service Public&quot; ISSeP &quot;Rue Chéra, 200&quot; 4000 Liege Belgium" />
  <attribute name="processing_level" value="processing_level_test" />
  <attribute name="date_created" value="2026-04-02T19:51:49.892053Z" />
  <attribute name="date_metadata_modified" value="2026-03-13T00:00:00Z" />
  <attribute name="creator_name" value="Benjamin Bergmans, Laurent Spanu" />
  <attribute name="creator_type" value="person" />
  <attribute name="creator_email" value="b.bergmans@issep.be, l.spanu@issep.be" />
  <attribute name="creator_institution" value="&quot;Institut Scientifique de Service Public, 200, ISSeP&quot;, &quot;Institut Scientifique de Service Public, 200, ISSeP&quot;" />
  <attribute name="contributor_name" value="Benjamin Palmaerts" />
  <attribute name="contributor_role" value="data submitter" />
  <attribute name="publisher_type" value="institution" />
  <attribute name="publisher_name" value="NILU - Norwegian Institute for Air Research, ATMOS, EBAS" />
  <attribute name="publisher_institution" value="NILU - Norwegian Institute for Air Research, ATMOS, EBAS" />
  <attribute name="publisher_email" value="ebas@nilu.no" />
  <attribute name="publisher_url" value="https://www.nilu.no/" />
  <attribute name="geospatial_bounds" value="POINT Z (6.001271 50.304003 490.5)" />
  <attribute name="geospatial_lat_min" type="double" value="50.304003" />
  <attribute name="geospatial_lat_max" type="double" value="50.304003" />
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  <attribute name="geospatial_lon_max" type="double" value="6.001271" />
  <attribute name="geospatial_vertical_min" type="double" value="490.5" />
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  <attribute name="time_coverage_start" value="2025-01-01T00:00:00Z" />
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  <attribute name="timezone" value="UTC" />
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  <attribute name="ebas_citation" value="Bergmans, B., Spanu, L., EMEP, GAW-WDCRG, 2026, Ozone at Vielsalm, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/V2MC-PXMC" />
  <attribute name="ebas_set_type_code" value="TU" />
  <attribute name="ebas_timezone" value="UTC" />
  <attribute name="ebas_file_name" value="V2MC-PXMC.nc" />
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  <attribute name="ebas_file_creation" value="2026-05-22T04:02:36.657785Z" />
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  <attribute name="ebas_startdate" value="2025-01-01T00:00:00.000000Z" />
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  <attribute name="ebas_version_description" value="initial revision, manually inspected" />
  <attribute name="ebas_statistics" value="arithmetic mean" />
  <attribute name="ebas_data_level" value="2" />
  <attribute name="ebas_period_code" value="1y" />
  <attribute name="ebas_resolution_code" value="1h" />
  <attribute name="ebas_sample_duration" value="1h" />
  <attribute name="ebas_orig_time_res" value="10s" />
  <attribute name="ebas_station_code" value="BE0007R" />
  <attribute name="ebas_platform_code" value="BE0007S" />
  <attribute name="ebas_station_name" value="Vielsalm" />
  <attribute name="ebas_station_latitude" type="double" value="50.304003" />
  <attribute name="ebas_station_longitude" type="double" value="6.001271" />
  <attribute name="ebas_station_altitude" value="487.0 m" />
  <attribute name="ebas_measurement_altitude" value="490.5 m" />
  <attribute name="ebas_measurement_height" value="3.5 m" />
  <attribute name="ebas_regime" value="IMG" />
  <attribute name="ebas_component" value="ozone" />
  <attribute name="ebas_matrix" value="air" />
  <attribute name="ebas_laboratory_code" value="BE03L" />
  <attribute name="ebas_instrument_type" value="uv_abs" />
  <attribute name="ebas_instrument_name" value="N085O3" />
  <attribute name="ebas_instrument_manufacturer" value="Horiba" />
  <attribute name="ebas_instrument_model" value="APOA-370" />
  <attribute name="ebas_instrument_serial_number" value="3B751ABX" />
  <attribute name="ebas_method_ref" value="BE03L_DC1_Me_266_P04" />
  <attribute name="ebas_standard_method" value="None" />
  <attribute name="ebas_inlet_type" value="Hat or hood" />
  <attribute name="ebas_inlet_description" value="Downward facing with insect protection" />
  <attribute name="ebas_inlet_tube_material" value="Teflon" />
  <attribute name="ebas_inlet_tube_outer_diameter" value="6.0 mm" />
  <attribute name="ebas_inlet_tube_length" value="4.0 m" />
  <attribute name="ebas_maintenance_description" value="Monthly preventive test, inlet filter replaced every 1 month, biannual leak test, ozone scrubber checked and replaced if needed once/year" />
  <attribute name="ebas_flow_rate" value="0.8 l/min" />
  <attribute name="ebas_zero_span_check_type" value="automatic" />
  <attribute name="ebas_zero_span_check_interval" value="2d" />
  <attribute name="ebas_humidity_temperaure_control" value="Temperature conditioning at 20 deg. C" />
  <attribute name="ebas_humidity_temperaure_control_description" value="Shelter is air-conditioned. No drying of sampled air" />
  <attribute name="ebas_detection_limit_expl" value="LOD was determined by taking 3 times standard deviation of the ensemble of gas zero measurements." />
  <attribute name="ebas_absorption_cross_section" value="CCQM.O3.2019" />
  <attribute name="ebas_organization" value="BE03L, Institut Scientifique de Service Public, ISSeP, , &quot;Rue Chéra, 200&quot;, , 4000, Liege, Belgium" />
  <attribute name="ebas_framework_acronym" value="EMEP, GAW-WDCRG" />
  <attribute name="ebas_framework_name" value="European Monitoring and Evaluation Programme, World Data Centre for Reactive Gases" />
  <attribute name="ebas_framework_description" value="The European Monitoring and Evaluation Programme (EMEP) is a scientifically based and policy driven programme under the Convention on Long-range Transboundary Air Pollution (CLRTAP) for int'l co-operation to solve transboundary air pollution problems., 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="Kjetil Tørseth, Kjetil Tørseth" />
  <attribute name="ebas_framework_contact_email" value="kt@nilu.no, kt@nilu.no" />
  <attribute name="ebas_originator" value="&quot;Bergmans, Benjamin, b.bergmans@issep.be, Institut Scientifique de Service Public, ISSeP, 200, Air Quality, Rue du Chera 200, , 4000 Liege, Belgium&quot;, &quot;Spanu, Laurent, l.spanu@issep.be, Institut Scientifique de Service Public, ISSeP, 200, Air Quality, Rue du Chéra 200, 4000, Liège, Belgium&quot;" />
  <attribute name="ebas_submitter" value="&quot;Palmaerts, Benjamin, b.palmaerts@issep.be, Institut Scientifique de Service Public, ISSeP, 200, Air Quality, Rue du Chéra 200, 4000, Liège, 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 frameworks: EMEP, GAW-WDCRG. Request acknowledgement details from data originator" />
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  <attribute name="Metadata_Conventions" value="Unidata Dataset Discovery v1.0" />
  <attribute name="geospatial_lat_units" value="degrees_north" />
  <attribute name="geospatial_lon_units" value="degrees_east" />
  <attribute name="standard_name_vocabulary" value="CF-1.7, ACDD-1.3" />
  <attribute name="history" value="None" />
  <attribute name="creator_url" value="ebas.nilu.no" />
  <attribute name="_CoordSysBuilder" value="ucar.nc2.internal.dataset.conv.CF1Convention" />
  <dimension name="time" length="8760" />
  <dimension name="tbnds" length="2" />
  <dimension name="metadata_time" length="1" />
  <dimension name="qc_ozone_nmol_per_mol_flags" length="1" />
  <dimension name="qc_ozone_ug_per_m3_flags" length="1" />
  <group name="CFMetadata">
    <attribute name="time_coverage_start" value="2025-01-01T00:30:00Z" />
    <attribute name="time_coverage_end" value="2025-12-31T23:30:00Z" />
    <attribute name="time_coverage_units" value="seconds" />
    <attribute name="time_coverage_resolution" value="3600.0" />
    <attribute name="time_coverage_duration" value="P0Y0M364DT23H0M0.000S" />
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  <group name="NCISOMetadata">
    <attribute name="metadata_creation" value="2026-05-30" />
    <attribute name="nciso_version" value="2.4.8" />
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  <variable name="time_bnds" shape="time tbnds" type="double">
    <attribute name="long_name" value="time bounds for measurement" />
  </variable>
  <variable name="metadata_time_bnds" shape="metadata_time tbnds" type="double">
    <attribute name="long_name" value="time bounds for ebas metadata intervals" />
  </variable>
  <variable name="v_ozone_nmol_per_mol" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mole_fraction_of_ozone_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="nmol/mol" />
    <attribute name="ancillary_variables" value="qc_ozone_nmol_per_mol meta_ozone_nmol_per_mol" />
    <attribute name="cell_methods" value="time: mean" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2026-03-13T00:00:00.000000Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision, manually inspected" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="10s" />
    <attribute name="ebas_station_code" value="BE0007R" />
    <attribute name="ebas_platform_code" value="BE0007S" />
    <attribute name="ebas_station_name" value="Vielsalm" />
    <attribute name="ebas_station_latitude" type="double" value="50.304003" />
    <attribute name="ebas_station_longitude" type="double" value="6.001271" />
    <attribute name="ebas_station_altitude" value="487.0 m" />
    <attribute name="ebas_measurement_altitude" value="490.5 m" />
    <attribute name="ebas_measurement_height" value="3.5 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="ozone" />
    <attribute name="ebas_unit" value="nmol/mol" />
    <attribute name="ebas_matrix" value="air" />
    <attribute name="ebas_laboratory_code" value="BE03L" />
    <attribute name="ebas_instrument_type" value="uv_abs" />
    <attribute name="ebas_instrument_name" value="N085O3" />
    <attribute name="ebas_instrument_manufacturer" value="Horiba" />
    <attribute name="ebas_instrument_model" value="APOA-370" />
    <attribute name="ebas_instrument_serial_number" value="3B751ABX" />
    <attribute name="ebas_method_ref" value="BE03L_DC1_Me_266_P04" />
    <attribute name="ebas_standard_method" value="None" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Downward facing with insect protection" />
    <attribute name="ebas_inlet_tube_material" value="Teflon" />
    <attribute name="ebas_inlet_tube_outer_diameter" value="6.0 mm" />
    <attribute name="ebas_inlet_tube_length" value="4.0 m" />
    <attribute name="ebas_maintenance_description" value="Monthly preventive test, inlet filter replaced every 1 month, biannual leak test, ozone scrubber checked and replaced if needed once/year" />
    <attribute name="ebas_flow_rate" value="0.8 l/min" />
    <attribute name="ebas_zero_span_check_type" value="automatic" />
    <attribute name="ebas_zero_span_check_interval" value="2d" />
    <attribute name="ebas_humidity_temperaure_control" value="Temperature conditioning at 20 deg. C" />
    <attribute name="ebas_humidity_temperaure_control_description" value="Shelter is air-conditioned. No drying of sampled air" />
    <attribute name="ebas_detection_limit" value="0.0 nmol/mol" />
    <attribute name="ebas_detection_limit_expl" value="LOD was determined by taking 3 times standard deviation of the ensemble of gas zero measurements." />
    <attribute name="ebas_absorption_cross_section" value="CCQM.O3.2019" />
    <attribute name="ebas_organization" value="BE03L, Institut Scientifique de Service Public, ISSeP, , &quot;Rue Chéra, 200&quot;, , 4000, Liege, Belgium" />
    <attribute name="ebas_framework_acronym" value="EMEP, GAW-WDCRG" />
    <attribute name="ebas_framework_name" value="European Monitoring and Evaluation Programme, World Data Centre for Reactive Gases" />
    <attribute name="ebas_framework_description" value="The European Monitoring and Evaluation Programme (EMEP) is a scientifically based and policy driven programme under the Convention on Long-range Transboundary Air Pollution (CLRTAP) for int'l co-operation to solve transboundary air pollution problems., 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="Kjetil Tørseth, Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="kt@nilu.no, kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Bergmans, Benjamin, b.bergmans@issep.be, Institut Scientifique de Service Public, ISSeP, 200, Air Quality, Rue du Chera 200, , 4000 Liege, Belgium&quot;, &quot;Spanu, Laurent, l.spanu@issep.be, Institut Scientifique de Service Public, ISSeP, 200, Air Quality, Rue du Chéra 200, 4000, Liège, Belgium&quot;" />
    <attribute name="ebas_submitter" value="&quot;Palmaerts, Benjamin, b.palmaerts@issep.be, Institut Scientifique de Service Public, ISSeP, 200, Air Quality, Rue du Chéra 200, 4000, Liège, 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 frameworks: EMEP, GAW-WDCRG. Request acknowledgement details from data originator" />
    <attribute name="ebas_comment" value="Data converted on export from EBAS from 'ug/m3' at 293.15 K, 1013.25 hPa to 'nmol/mol', conversion factor 0.50. Detection limit converted from '0.5 ug/m3' at 293.15 K, 1013.25 hPa to '0.0 nmol/mol', conversion factor 0.50." />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/ozoneamountfraction" />
    <attribute name="actris_variable_preferred_term" value="ozone amount fraction" />
    <attribute name="actris_matrix_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/gasphase" />
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    <attribute name="standard_name" value="status_flag" />
    <attribute name="missing_value" type="int" value="0" />
    <attribute name="units" value="1" />
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    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
  </variable>
  <variable name="v_ozone_ug_per_m3" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mass_concentration_of_ozone_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="ug/m3" />
    <attribute name="ancillary_variables" value="qc_ozone_ug_per_m3 meta_ozone_ug_per_m3" />
    <attribute name="cell_methods" value="time: mean" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2026-03-13T00:00:00.000000Z" />
    <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="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_orig_time_res" value="10s" />
    <attribute name="ebas_station_code" value="BE0007R" />
    <attribute name="ebas_platform_code" value="BE0007S" />
    <attribute name="ebas_station_name" value="Vielsalm" />
    <attribute name="ebas_station_latitude" type="double" value="50.304003" />
    <attribute name="ebas_station_longitude" type="double" value="6.001271" />
    <attribute name="ebas_station_altitude" value="487.0 m" />
    <attribute name="ebas_measurement_altitude" value="490.5 m" />
    <attribute name="ebas_measurement_height" value="3.5 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="ozone" />
    <attribute name="ebas_unit" value="ug/m3" />
    <attribute name="ebas_matrix" value="air" />
    <attribute name="ebas_laboratory_code" value="BE03L" />
    <attribute name="ebas_instrument_type" value="uv_abs" />
    <attribute name="ebas_instrument_name" value="N085O3" />
    <attribute name="ebas_instrument_manufacturer" value="Horiba" />
    <attribute name="ebas_instrument_model" value="APOA-370" />
    <attribute name="ebas_instrument_serial_number" value="3B751ABX" />
    <attribute name="ebas_method_ref" value="BE03L_DC1_Me_266_P04" />
    <attribute name="ebas_standard_method" value="None" />
    <attribute name="ebas_inlet_type" value="Hat or hood" />
    <attribute name="ebas_inlet_description" value="Downward facing with insect protection" />
    <attribute name="ebas_inlet_tube_material" value="Teflon" />
    <attribute name="ebas_inlet_tube_outer_diameter" value="6.0 mm" />
    <attribute name="ebas_inlet_tube_length" value="4.0 m" />
    <attribute name="ebas_maintenance_description" value="Monthly preventive test, inlet filter replaced every 1 month, biannual leak test, ozone scrubber checked and replaced if needed once/year" />
    <attribute name="ebas_flow_rate" value="0.8 l/min" />
    <attribute name="ebas_zero_span_check_type" value="automatic" />
    <attribute name="ebas_zero_span_check_interval" value="2d" />
    <attribute name="ebas_humidity_temperaure_control" value="Temperature conditioning at 20 deg. C" />
    <attribute name="ebas_humidity_temperaure_control_description" value="Shelter is air-conditioned. No drying of sampled air" />
    <attribute name="ebas_volume_std_temperature" value="293.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
    <attribute name="ebas_detection_limit" value="0.5 ug/m3" />
    <attribute name="ebas_detection_limit_expl" value="LOD was determined by taking 3 times standard deviation of the ensemble of gas zero measurements." />
    <attribute name="ebas_absorption_cross_section" value="CCQM.O3.2019" />
    <attribute name="ebas_organization" value="BE03L, Institut Scientifique de Service Public, ISSeP, , &quot;Rue Chéra, 200&quot;, , 4000, Liege, Belgium" />
    <attribute name="ebas_framework_acronym" value="EMEP, GAW-WDCRG" />
    <attribute name="ebas_framework_name" value="European Monitoring and Evaluation Programme, World Data Centre for Reactive Gases" />
    <attribute name="ebas_framework_description" value="The European Monitoring and Evaluation Programme (EMEP) is a scientifically based and policy driven programme under the Convention on Long-range Transboundary Air Pollution (CLRTAP) for int'l co-operation to solve transboundary air pollution problems., 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="Kjetil Tørseth, Kjetil Tørseth" />
    <attribute name="ebas_framework_contact_email" value="kt@nilu.no, kt@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Bergmans, Benjamin, b.bergmans@issep.be, Institut Scientifique de Service Public, ISSeP, 200, Air Quality, Rue du Chera 200, , 4000 Liege, Belgium&quot;, &quot;Spanu, Laurent, l.spanu@issep.be, Institut Scientifique de Service Public, ISSeP, 200, Air Quality, Rue du Chéra 200, 4000, Liège, Belgium&quot;" />
    <attribute name="ebas_submitter" value="&quot;Palmaerts, Benjamin, b.palmaerts@issep.be, Institut Scientifique de Service Public, ISSeP, 200, Air Quality, Rue du Chéra 200, 4000, Liège, 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 frameworks: EMEP, GAW-WDCRG. Request acknowledgement details from data originator" />
    <attribute name="actris_variable_uri" value="https://vocabulary.actris.nilu.no/actris_vocab/ozonemassconcentration" />
    <attribute name="actris_variable_preferred_term" value="ozone 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_temporal_resolution" value="PT1H" />
    <attribute name="actris_access_restriction" type="long" value="0" />
  </variable>
  <variable name="qc_ozone_ug_per_m3" shape="qc_ozone_ug_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_ozone_ug_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" />
    <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" />
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