Guidance
Air pollution monitoring: Acid Gas and Aerosol Network (AGA Net)
How to get air pollution data from the AGA Net and the pollutants it measures.
The Acid Gas and Aerosol Network (AGA Net) monitors atmospheric pollutants at 28 stations across the UK.
The AGA Net provides information on the long-term rural trends of pollutants that:
- make the environment more acidic (acidification)
- cause excess nutrients in water (eutrophication)
The AGA Net provides monthly average air pollution data for:
- concentrations of acid gases
- compositions of inorganic aerosols
It is part of the UK Eutrophying and Acidifying Atmospheric Pollutants (UKEAP) Network that monitors long-term pollutant trends in rural and remote locations.
Get air pollution data from the AGA Net
Get air pollution data from the AGA Net.
Pollutants the AGA Net measures
The AGA Net measures:
- ammonia (also measured in the National Ammonia Monitoring Network)
- ammonium (also measured in the National Ammonia Monitoring Network)
- gaseous nitric acid
- hydrochloric acid (until 2016)
- particulate calcium
- particulate chloride
- sulphur dioxide
- particulate magnesium
- particulate nitrate
- particulate sodium
- particulate sulphate
How the AGA Net measures data
The AGA Net measures pollutants with CEH (UK Centre for Ecology and Hydrology) DELTA (denuder for long-term atmospheric sampling) samplers.
AGA Net start date
The AGA Net started on 1 September 1999.
Updates to this page
Published 25 June 2026