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 The AGA Net measures monthly measures:concentrations of gaseous and aerosol pollutants.

• ammonia

  Gaseous (alsopollutants  

  It measuredmeasures in the Nationalfollowing Ammoniagaseous Monitoringpollutants:

  • ammonia Network)(NH₃) 
  • ammoniumnitric (alsoacid measured(HNO₃) 
  • sulphur indioxide the(SO₂) 

  Aerosol National(airborne Ammoniaparticle) Monitoringpollutants 

  It Network)

• gaseousmeasures nitricthe acid
• hydrochloricfollowing acidaerosol (until 2016)
pollutants:
• particulateammonium calcium(NH₄⁺) 
• particulatenitrate chloride(NO₃⁻) 
• sulphursulphate dioxide(SO₄²⁻) 
• particulatechloride magnesium(Cl⁻) 
• particulatesodium nitrate(Na⁺) 
• particulatecalcium sodium(Ca²⁺) 
• particulatemagnesium sulphate(Mg²⁺)

HowMonitoring the AGA Net measures datainstruments

The AGA Net measures pollutants with CEH (UK Centre for Ecology and Hydrology) DELTA (denuderDELTA (DEnuder for long-termLong-Term atmosphericAtmospheric sampling) samplers.

AGA Net start date

The AGA Net started on 1 September 1999.

Latest  UKEAP  annual report 

The UKEAP annual report 2024 provides: 

• network operation updates 
• annual pollutant concentrations 
• interpretation of data and trends 
• a summary of scientific research, publications and other activities related to the network