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Ammonia and Water Abundance Measurements from Los Gatos Research Ammonia Analyzer Instrument at Manchester Air Quality Site 2019 onwards.

Update Frequency: Monthly
Latest Data Update: 2023-06-06
Status: Ongoing
Online Status: ONLINE
Publication State: Published
Publication Date: 2023-01-25
Download Stats: last 12 months
Dataset Size: 192 Files | 386MB


Ammonia (NH3) and water (H20) abundance measurements made at 7 metres above ground level by a Los Gatos research ammonia analyzer instrument at Manchester air quality site (MAQS) for the Integrated Research Observation System for Clean Air (OSCA) project.

Citable as:  Watson, N. (2023): Ammonia and Water Abundance Measurements from Los Gatos Research Ammonia Analyzer Instrument at Manchester Air Quality Site 2019 onwards.. NERC EDS Centre for Environmental Data Analysis, date of citation.
Abbreviation: Not defined
Keywords: NH3, H20, 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 are transferred directly from the instrument to the computer database, before being transferred to the general database, where it is processed, averaged over minute time intervals and flagged where data is suspect. Data processing software found in:
Once complete, data are uploaded to CEDA for archiving.

Data Quality:
The baseline zero for the NH3 measurement has been checked using a zero-cylinder on 26th-27th July 2021. If the zero-corrected NH3 level falls below 0.5ppb or above 300 ppb it is flagged. 0.5 ppb is quoted by Los Gatos Research as the lower limit for the reliability of the Ammonia Analyser.
File Format:
NetCDF and CSV format

Related Documents

 OSCA Project Webpage

Process overview

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


  • units: 1
  • var_id: qc_flag_h2o
  • long_name: Data Quality flag: H2O
  • units: 1
  • var_id: qc_flag_nh3
  • long_name: Data Quality flag: NH3
  • 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:
  • units: ppb
  • var_id: mole_fraction_of_ammonia_in_air
  • standard_name: mole_fraction_of_ammonia_in_air
  • long_name: Mole Fraction of Ammonia in air
  • units: ppm
  • standard_name: mole_fraction_of_water_vapor_in_air
  • var_id: mole_fraction_of_water_vapor_in_air
  • long_name: Mole Fraction of Water Vapor in air
  • 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