Categories > topics > biological and physical processes > atmospheric and climatic processes > atmospheric deposition (chemical & particulate)
acid deposition
The process by which emissions, chiefly sulfur and nitrogen compounds, either react with the atmosphere when deposited on earth by precipitation of snow, rain, or fog with a pH of 5.5 or below, or settle out as acidic particles or gases.
This category is also used for acid precipitation, acid rain, acid snow, and acidic deposition