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Mass Concentration of the Non-Refractory Component of Ambient Aerosol Particles in Air Data from Aerosol Chemical Species Monitor (ACSM) at Manchester Air Quality Site, 2019-present

Update Frequency: Monthly
Latest Data Update: 2023-06-07
Status: Ongoing
Online Status: ONLINE
Publication State: Published
Publication Date: 2023-01-17
Download Stats: last 12 months
Dataset Size: 209 Files | 30MB


Mass Concentration of the Nitrate, Chloride, Sulphate, Ammonium and Organic Component of Ambient Aerosol Particles in Air measured at 7 metres above ground level by an Aerosol Chemical Species Monitor (ACSM) at the Manchester Air Quality Site (MAQS), from 2019 onwards, for the Integrated Research Observation System for Clean Air (OSCA) project.

Citable as:  Watson, N.; Allan, J.D.; Flynn, M. (2023): Mass Concentration of the Non-Refractory Component of Ambient Aerosol Particles in Air Data from Aerosol Chemical Species Monitor (ACSM) at Manchester Air Quality Site, 2019-present. NERC EDS Centre for Environmental Data Analysis, date of citation.
Abbreviation: Not defined
Keywords: OSCA, maqs, air quality, OSCA-AQ


Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
Access to these data is available to any registered CEDA user. Please Login or Register for an account to gain access.
Use of these data is covered by the following licence: When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data is transfered directly from the instrument to the computer database, before being transferred to the general database, where it is processed using the Calibration data within the ACSM data. It is then divided into monthly files and data is flagged where data is suspect.
Data processing software found in:
Data obtained from 3750 CPC for June 2019 - February 2021 and December 2021 - February 2022
Data obtained from 3772 CPC for February - September 2021
Intercomparison between CPCs Data obtained from 3750 CPC and 3772 CPC.

Data Quality:
Data is calibrated for nitrate mass ionisation efficiencies (mIE) and the relative ionisation efficiencies (RIE) for ammonium and sulphate measurements. For full report on ACSM processing method see github file: .
File Format:
NetCDF and CSV

Related Documents

No documents related to this record were found.

Process overview

This dataset was generated by instruments deployed on platforms as listed below.
Output Description


  • units: 1
  • var_id: qc_flag_mass_concentration_of_chlorides_in_ambient_aerosol_particles_in_air
  • long_name: Data Quality flag: Chl
  • units: 1
  • var_id: qc_flag_mass_concentration_of_ammonia_in_ambient_aerosol_particles_in_air
  • long_name: Data Quality flag: NH4
  • units: 1
  • var_id: qc_flag_mass_concentration_of_nitrate_in_ambient_aerosol_particles_in_air
  • long_name: Data Quality flag: NO3
  • units: 1
  • var_id: qc_flag_mass_concentration_of_sulfate_in_ambient_aerosol_particles_in_air
  • long_name: Data Quality flag: SO4
  • units: 1
  • var_id: qc_flag_mass_concentration_of_organics_in_ambient_aerosol_particles_in_air
  • long_name: Data Quality flag: organics
  • long_name: Day
  • var_id: day
  • standard_name:
  • units: 1
  • long_name: Day of Year
  • var_id: day_of_year
  • standard_name:
  • long_name: Hour
  • var_id: hour
  • standard_name:
  • long_name: Month
  • var_id: month
  • standard_name:
  • var_id: time
  • units: seconds
  • long_name: Time (seconds since 1970-01-01 00:00:00)
  • long_name: Year
  • var_id: year
  • standard_name:
  • var_id: minute
  • standard_name:
  • long_name: minute
  • var_id: second
  • standard_name:
  • long_name: second

Co-ordinate Variables

  • units: degree_north
  • standard_name: latitude
  • var_id: latitude
  • long_name: Latitude
  • units: degree_east
  • standard_name: longitude
  • var_id: longitude
  • long_name: Longitude
Temporal Range
Start time:
End time:
Geographic Extent