Acid deposition

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A complex chemical and atmospheric phenomenon that occurs when emissions of sulphur and nitrogen compounds and other sub-stances with a low pH (i.e. are acidic) are transformed by chemical processes in the atmosphere, often far from the original sources, and then deposited on earth in either a wet or a dry form. The wet forms, popularly called “acid rain,” can fall as rain, snow, or fog. The dry forms are acidic gases or particulates.

Links

Acid Deposition (Air Pollution Information System)
What is Acid Rain (US EPA)
Acid Rain (National Geographic)