Atmospheric Ammonia

Dear Colleagues,

Ammonia is a primary pollutant, emitted primarily from agriculture and waste management processes. Ammonia emissions are estimated to have at least doubled over the last century across Europe. The primary causes for ammonia emissions are intensive agriculture (particularly fertilisation with urea), together with various non-agricultural sources such as sewage treatment, catalytic converters, anaerobic digesters (rapidly increasing since 2010) and industrial processes. Emissions from diesel vehicles will increase in the future, particularly in urban environments, due to the application of urea as a selective catalyst for reducing NOx emissions. Ammonia is the major precursor for neutralising atmospheric acids and thus affects the long-range transport of SO2 and NOx as well as the stabilisation of secondary particulate matter (PM10, PM2.5 aerosol). Ammonia emissions are on average increasing and future climate scenarios show that the pollutant and its environmental effects will increase through the 21st century globally. Ammonia is transported through the atmosphere both as a gas and in PM as ammonium. In the past decade significant steps forward in measuring this sticky trace gas, and understanding the effects both on ecosystems and human health impacts have been made. This Special Issue will cover all aspects of atmospheric ammonia science, through the challenges of ammonia metrology, emission factors measurement, climate and integration of measurement-modelling approaches to understand local, landscape, regional- and global-scale issues, with a view to the future mitigation and abatement of ammonia pollution.

Dr. Christine F. Braban
Guest Editor

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• ammonia
• particulate matter
• agriculture
• ammonium
• metrology
• emission inventory
• air quality
• ecosystem pollution
• modelling