UKEAP: National Ammonia Monitoring Network

What is measured?

Gaseous ammonia (NH3) is measured monthly at 85 sites across the UK. The monitoring provides a baseline in the reduced nitrogen species (NH3 + NH4+), which is necessary for examining responses to changes in the agricultural sector and to verify compliance with targets set by international agreements.

What is the purpose of the network?

Established in 1996, the objectives of the network are to quantify temporal and spatial changes in air concentrations and deposition in NH3 and NH4+ (included since 1999) on a long term basis.

Monitoring methods?

There are currently 95 sites in the NAMN - at 59 of these sites, an active diffusion denuder methodology using the CEH DELTA (DEnuder for Long Term Atmospheric sampling) system (where power is available) is used to provide the main spatial and temporal patterns of NH3 across the UK. Aerosol NH4+ is monitored at a subset of DELTA sites. A secondary network of ALPHA (Adapted Low-cost Passive High-Absorption) samplers are employed at a further 49 sites to assess regional and local scale variability in air NH3 concentrations. To provide an ongoing validation of the ALPHA sampler, the method is calibrated against the DELTA method at 12 sites within the network.

View data for sites in this network

Data can be downloaded from the Defra Pollutant Deposition webpages.

View data for sites for UKEAP: National Ammonia Monitoring Network network

Use the dropdown list below to view data for a particular monitoring site.