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  <attribute name="featureType" value="timeSeries" />
  <attribute name="title" value="Particle_number_concentration at Villeneuve d'Ascq" />
  <attribute name="summary" value="Particle_number_concentration at Villeneuve d'Ascq. These measurements are gathered as a part of the following projects ACTRIS, GAW-WDCA and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: ['pressure in instrument', 'temperature in instrument', 'particle_number_concentration in pm25 (mass_concentration_of_particle_number_concentration_in_pm2p5_in_air)']" />
  <attribute name="keywords" value="&quot;Villeneuve d'Ascq&quot; FR0027U particle_number_concentration pm25 ACTRIS GAW-WDCA mass_concentration_of_particle_number_concentration_in_pm2p5_in_air" />
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  <attribute name="project" value="ACTRIS, GAW-WDCA" />
  <attribute name="acknowledgement" value="" />
  <attribute name="doi" value="https://doi.org/10.48597/HFRW-PCJ8" />
  <attribute name="license" value="https://creativecommons.org/licenses/by/4.0/" />
  <attribute name="citation" value="Crumeyrolle, S., ACTRIS, GAW-WDCA, 2026, Particle_number_concentration at Villeneuve d'Ascq, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/HFRW-PCJ8" />
  <attribute name="source" value="surface observation" />
  <attribute name="institution" value="FR28L &quot;Université de Lille&quot; &quot;LOA Univ. Lille&quot; &quot;Laboratoire d'Optique Atmosphérique&quot; &quot;Cité Scientifique&quot; 59655 &quot;Villeneuve d'Ascq Cedex&quot; France" />
  <attribute name="processing_level" value="processing_level_test" />
  <attribute name="date_created" value="2026-06-12T09:22:49.760670Z" />
  <attribute name="date_metadata_modified" value="2026-06-12T09:22:49Z" />
  <attribute name="creator_name" value="Suzanne Crumeyrolle" />
  <attribute name="creator_type" value="person" />
  <attribute name="creator_email" value="suzanne.crumeyrolle@univ-lille.fr" />
  <attribute name="creator_institution" value="&quot;Universite de Lille, Laboratoire d'Optique Atmospherique&quot;" />
  <attribute name="contributor_name" value="Nicolas Pascal" />
  <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="MULTIPOINT Z ((3.1403 50.611 70), (3.14035 50.611017 70))" />
  <attribute name="geospatial_lat_min" type="double" value="50.611" />
  <attribute name="geospatial_lat_max" type="double" value="50.611017" />
  <attribute name="geospatial_lon_min" type="double" value="3.1403" />
  <attribute name="geospatial_lon_max" type="double" value="3.14035" />
  <attribute name="geospatial_vertical_min" type="double" value="70.0" />
  <attribute name="geospatial_vertical_max" type="double" value="70.0" />
  <attribute name="geospatial_vertical_positive" value="up" />
  <attribute name="geospatial_bounds_crs" value="EPSG:4979" />
  <attribute name="time_coverage_start" value="2024-01-01T00:00:00Z" />
  <attribute name="time_coverage_end" value="2026-01-01T00:00:00Z" />
  <attribute name="time_coverage_duration" value="P0002-00-00T00:00:00" />
  <attribute name="time_coverage_resolution" value="P0000-00-00T01:00:00" />
  <attribute name="timezone" value="UTC" />
  <attribute name="ebas_data_definition" value="EBAS_1.1" />
  <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
  <attribute name="ebas_citation" value="Crumeyrolle, S., ACTRIS, GAW-WDCA, 2026, Particle_number_concentration at Villeneuve d'Ascq, data hosted by EBAS at NILU, DOI: https://doi.org/10.48597/HFRW-PCJ8" />
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  <attribute name="ebas_file_name" value="HFRW-PCJ8.nc" />
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  <attribute name="ebas_file_creation" value="2026-06-14T02:22:35.914837Z" />
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  <attribute name="ebas_startdate" value="2024-01-01T00:00:00.000000Z" />
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  <attribute name="ebas_version" value="1" />
  <attribute name="ebas_version_description" value="initial revision" />
  <attribute name="ebas_data_level" value="2" />
  <attribute name="ebas_period_code" value="2y" />
  <attribute name="ebas_resolution_code" value="1h" />
  <attribute name="ebas_sample_duration" value="1h" />
  <attribute name="ebas_station_code" value="FR0027U" />
  <attribute name="ebas_platform_code" value="FR0027S" />
  <attribute name="ebas_station_name" value="Villeneuve d'Ascq" />
  <attribute name="ebas_station_gaw_id" value="VDA" />
  <attribute name="ebas_station_land_use" value="Other" />
  <attribute name="ebas_station_setting" value="Suburban" />
  <attribute name="ebas_station_wmo_region" type="long" value="6" />
  <attribute name="ebas_station_latitude" type="double" value="50.611017" />
  <attribute name="ebas_station_longitude" type="double" value="3.14035" />
  <attribute name="ebas_station_altitude" value="70.0 m" />
  <attribute name="ebas_measurement_latitude" type="double" value="50.611" />
  <attribute name="ebas_measurement_longitude" type="double" value="3.1403" />
  <attribute name="ebas_measurement_altitude" value="70.0 m" />
  <attribute name="ebas_measurement_height" value="20.0 m" />
  <attribute name="ebas_regime" value="IMG" />
  <attribute name="ebas_laboratory_code" value="FR28L" />
  <attribute name="ebas_instrument_type" value="cpc" />
  <attribute name="ebas_instrument_name" value="cpc_TSI_3750" />
  <attribute name="ebas_instrument_manufacturer" value="TSI" />
  <attribute name="ebas_instrument_model" value="3750" />
  <attribute name="ebas_instrument_serial_number" value="375010223601" />
  <attribute name="ebas_method_ref" value="FR28L_TSI_3750_VDA" />
  <attribute name="ebas_standard_method" value="None" />
  <attribute name="ebas_inlet_type" value="Stainless steel" />
  <attribute name="ebas_inlet_description" value="PM2.5" />
  <attribute name="ebas_humidity_temperaure_control" value="Nafion dryer" />
  <attribute name="ebas_humidity_temperaure_control_description" value="Room air temperature conditioned at 20 Celsius degrees" />
  <attribute name="ebas_volume_std_temperature" value="273.15 K" />
  <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
  <attribute name="ebas_measurement_uncertainty_expl" value="typical value of unit-to-unit variability" />
  <attribute name="ebas_zero_negative_values_code" value="Zero possible" />
  <attribute name="ebas_zero_negative_values" value="Zero values may appear due to statistical variations at very low concentrations" />
  <attribute name="ebas_organization" value="FR28L, Université de Lille, LOA Univ. Lille, Laboratoire d'Optique Atmosphérique, Cité Scientifique, , 59655, Villeneuve d'Ascq Cedex, France" />
  <attribute name="ebas_framework_acronym" value="ACTRIS, GAW-WDCA" />
  <attribute name="ebas_framework_name" value="&quot;European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases&quot;, World Data Centre for Aerosols" />
  <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;, &quot;The World Data Centre for Aerosols is the data repository and archive for microphysical, optical, and chemical properties of atmospheric aerosol of the World Meteorological Organisation's (WMO) Global Atmosphere Watch (GAW) programme.&quot;" />
  <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre, Markus Fiebig" />
  <attribute name="ebas_framework_contact_email" value="clm@nilu.no, Markus.Fiebig@nilu.no" />
  <attribute name="ebas_originator" value="&quot;Crumeyrolle, Suzanne, suzanne.crumeyrolle@univ-lille.fr, Universite de Lille, , Laboratoire d'Optique Atmospherique, UFR de physique - P5 bis - P358, cité Scientifique, 59650, Villeneuve-d'Ascq, France&quot;" />
  <attribute name="ebas_submitter" value="&quot;Pascal, Nicolas, , , , , , , , , &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-WDCA. For using this data for any kind of publications, you must contact the data originator, in terms of acknowledgment" />
  <attribute name="ebas_comment" value="For updated information on this data, please contact the data originator" />
  <attribute name="_NCProperties" value="version=2,netcdf=4.9.3,hdf5=1.14.6" />
  <attribute name="Metadata_Conventions" value="Unidata Dataset Discovery v1.0" />
  <attribute name="geospatial_lat_units" value="degrees_north" />
  <attribute name="geospatial_lon_units" value="degrees_east" />
  <attribute name="standard_name_vocabulary" value="CF-1.7, ACDD-1.3" />
  <attribute name="history" value="None" />
  <attribute name="creator_url" value="ebas.nilu.no" />
  <attribute name="_CoordSysBuilder" value="ucar.nc2.internal.dataset.conv.CF1Convention" />
  <dimension name="time" length="17544" />
  <dimension name="tbnds" length="2" />
  <dimension name="metadata_time" length="2" />
  <dimension name="d_Location" length="1" />
  <dimension name="qc_pressure_flags" length="1" />
  <dimension name="qc_temperature_flags" length="1" />
  <dimension name="qc_particle_number_concentration_amean_flags" length="1" />
  <dimension name="qc_particle_number_concentration_prec1587_flags" length="1" />
  <dimension name="qc_particle_number_concentration_perc8413_flags" length="1" />
  <group name="CFMetadata">
    <attribute name="time_coverage_start" value="2024-01-01T00:30:00Z" />
    <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="P0Y0M730DT23H0M0.000S" />
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  <group name="NCISOMetadata">
    <attribute name="metadata_creation" value="2026-06-26" />
    <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" />
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  <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_pressure" shape="d_Location time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="hPa" />
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    <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="2026-06-12T09:22:49.760670Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
    <attribute name="ebas_data_level" value="2" />
    <attribute name="ebas_sample_duration" value="1h" />
    <attribute name="ebas_station_code" value="FR0027U" />
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    <attribute name="ebas_station_name" value="Villeneuve d'Ascq" />
    <attribute name="ebas_station_gaw_id" value="VDA" />
    <attribute name="ebas_station_land_use" value="Other" />
    <attribute name="ebas_station_setting" value="Suburban" />
    <attribute name="ebas_station_wmo_region" type="long" value="6" />
    <attribute name="ebas_station_latitude" type="double" value="50.611017" />
    <attribute name="ebas_station_longitude" type="double" value="3.14035" />
    <attribute name="ebas_station_altitude" value="70.0 m" />
    <attribute name="ebas_measurement_latitude" type="double" value="50.611" />
    <attribute name="ebas_measurement_longitude" type="double" value="3.1403" />
    <attribute name="ebas_measurement_altitude" value="70.0 m" />
    <attribute name="ebas_measurement_height" value="20.0 m" />
    <attribute name="ebas_regime" value="IMG" />
    <attribute name="ebas_component" value="pressure" />
    <attribute name="ebas_unit" value="hPa" />
    <attribute name="ebas_matrix" value="instrument" />
    <attribute name="ebas_laboratory_code" value="FR28L" />
    <attribute name="ebas_instrument_type" value="cpc" />
    <attribute name="ebas_instrument_name" value="cpc_TSI_3750" />
    <attribute name="ebas_instrument_manufacturer" value="TSI" />
    <attribute name="ebas_instrument_model" value="3750" />
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    <attribute name="ebas_method_ref" value="FR28L_TSI_3750_VDA" />
    <attribute name="ebas_standard_method" value="None" />
    <attribute name="ebas_inlet_type" value="Stainless steel" />
    <attribute name="ebas_inlet_description" value="PM2.5" />
    <attribute name="ebas_humidity_temperaure_control" value="Nafion dryer" />
    <attribute name="ebas_humidity_temperaure_control_description" value="Room air temperature conditioned at 20 Celsius degrees" />
    <attribute name="ebas_volume_std_temperature" value="273.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
    <attribute name="ebas_measurement_uncertainty_expl" value="typical value of unit-to-unit variability" />
    <attribute name="ebas_zero_negative_values_code" value="Zero possible" />
    <attribute name="ebas_zero_negative_values" value="Zero values may appear due to statistical variations at very low concentrations" />
    <attribute name="ebas_organization" value="FR28L, Université de Lille, LOA Univ. Lille, Laboratoire d'Optique Atmosphérique, Cité Scientifique, , 59655, Villeneuve d'Ascq Cedex, France" />
    <attribute name="ebas_framework_acronym" value="ACTRIS, GAW-WDCA" />
    <attribute name="ebas_framework_name" value="&quot;European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases&quot;, World Data Centre for Aerosols" />
    <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;, &quot;The World Data Centre for Aerosols is the data repository and archive for microphysical, optical, and chemical properties of atmospheric aerosol of the World Meteorological Organisation's (WMO) Global Atmosphere Watch (GAW) programme.&quot;" />
    <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre, Markus Fiebig" />
    <attribute name="ebas_framework_contact_email" value="clm@nilu.no, Markus.Fiebig@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Crumeyrolle, Suzanne, suzanne.crumeyrolle@univ-lille.fr, Universite de Lille, , Laboratoire d'Optique Atmospherique, UFR de physique - P5 bis - P358, cité Scientifique, 59650, Villeneuve-d'Ascq, France&quot;" />
    <attribute name="ebas_submitter" value="&quot;Pascal, Nicolas, , , , , , , , , &quot;" />
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    <attribute name="ebas_comment" value="For updated information on this data, please contact the data originator" />
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    <attribute name="long_name" value="ebas metadata for different time intervals; json encoded" />
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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_description" value="initial revision" />
    <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="Villeneuve d'Ascq" />
    <attribute name="ebas_station_gaw_id" value="VDA" />
    <attribute name="ebas_station_land_use" value="Other" />
    <attribute name="ebas_station_setting" value="Suburban" />
    <attribute name="ebas_station_wmo_region" type="long" value="6" />
    <attribute name="ebas_station_latitude" type="double" value="50.611017" />
    <attribute name="ebas_station_longitude" type="double" value="3.14035" />
    <attribute name="ebas_station_altitude" value="70.0 m" />
    <attribute name="ebas_measurement_latitude" type="double" value="50.611" />
    <attribute name="ebas_measurement_longitude" type="double" value="3.1403" />
    <attribute name="ebas_measurement_altitude" value="70.0 m" />
    <attribute name="ebas_measurement_height" value="20.0 m" />
    <attribute name="ebas_regime" value="IMG" />
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    <attribute name="ebas_matrix" value="instrument" />
    <attribute name="ebas_laboratory_code" value="FR28L" />
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    <attribute name="ebas_standard_method" value="None" />
    <attribute name="ebas_inlet_type" value="Stainless steel" />
    <attribute name="ebas_inlet_description" value="PM2.5" />
    <attribute name="ebas_humidity_temperaure_control" value="Nafion dryer" />
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    <attribute name="ebas_volume_std_temperature" value="273.15 K" />
    <attribute name="ebas_volume_std_pressure" value="1013.25 hPa" />
    <attribute name="ebas_measurement_uncertainty_expl" value="typical value of unit-to-unit variability" />
    <attribute name="ebas_zero_negative_values_code" value="Zero possible" />
    <attribute name="ebas_zero_negative_values" value="Zero values may appear due to statistical variations at very low concentrations" />
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    <attribute name="ebas_framework_acronym" value="ACTRIS, GAW-WDCA" />
    <attribute name="ebas_framework_name" value="&quot;European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases&quot;, World Data Centre for Aerosols" />
    <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;, &quot;The World Data Centre for Aerosols is the data repository and archive for microphysical, optical, and chemical properties of atmospheric aerosol of the World Meteorological Organisation's (WMO) Global Atmosphere Watch (GAW) programme.&quot;" />
    <attribute name="ebas_framework_contact_name" value="Cathrine Lund Myhre, Markus Fiebig" />
    <attribute name="ebas_framework_contact_email" value="clm@nilu.no, Markus.Fiebig@nilu.no" />
    <attribute name="ebas_originator" value="&quot;Crumeyrolle, Suzanne, suzanne.crumeyrolle@univ-lille.fr, Universite de Lille, , Laboratoire d'Optique Atmospherique, UFR de physique - P5 bis - P358, cité Scientifique, 59650, Villeneuve-d'Ascq, France&quot;" />
    <attribute name="ebas_submitter" value="&quot;Pascal, Nicolas, , , , , , , , , &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-WDCA. For using this data for any kind of publications, you must contact the data originator, in terms of acknowledgment" />
    <attribute name="ebas_comment" value="For updated information on this data, please contact the data originator" />
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  <variable name="qc_temperature" shape="d_Location qc_temperature_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" />
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  <variable name="v_particle_number_concentration_amean" shape="time" type="double">
    <attribute name="_FillValue" type="double" value="NaN" />
    <attribute name="standard_name" value="mass_concentration_of_particle_number_concentration_in_pm2p5_in_air" />
    <attribute name="missing_value" type="double" value="NaN" />
    <attribute name="units" value="1/cm3" />
    <attribute name="ancillary_variables" value="qc_particle_number_concentration_amean meta_particle_number_concentration_amean" />
    <attribute name="cell_methods" value="time: mean" />
    <attribute name="ebas_data_license" value="https://creativecommons.org/licenses/by/4.0/" />
    <attribute name="ebas_revision_date" value="2026-06-12T09:22:49.760670Z" />
    <attribute name="ebas_version" value="1" />
    <attribute name="ebas_version_description" value="initial revision" />
    <attribute name="ebas_statistics" value="arithmetic mean" />
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