Contributions of natural and anthropogenic sources to ambient ammonia in the Athabasca Oil Sands and north-western Canada
Atmospheric ammonia (NH3) is a short-lived pollutant that plays an important role in aerosol chemistry and nitrogen deposition.Dominant NH3 emissions are from agriculture and forest fires, both of which are increasing globally.Even remote regions with relatively low ambient NH3 concentrations, such as northern Alberta and Saskatchewan in northern C