This is a Defra-funded long-term dataset of gaseous NH3 (since September 1996) and aerosol NH4(+) (since January 1999) measured at several UK sites using the DEnuder for Long-Term Atmospheric (DELTA) system, together with the high sensitivity Adapted Low-cost Passive High Absorption (ALPHA) sampler, allowing changes in atmospheric NHx to be quantified spatially across the UK.
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