Schnabel, Ronald R. Northeast Watershed Research Center, Agricultural Research Service, U.S. Department of Agriculture, University Park, Pennsylvania.
Lamb, Dennis Department of Meteorology, Pennsylvania State University, University Park, Pennsylvania.
Pionke, Harry B. Northeast Watershed Research Center, U.S. Department of Agriculture, University Park, Pennsylvania.
Genito, Dennis Pasture Laboratory, Agricultural Research Service, U.S. Department of Agriculture, University Park, Pennsylvania.
Last reviewed:February 2017
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- Sources of acidity
- How rain becomes acidic
- Terrestrial and aquatic effects
- Aquatic biology effects
- Links to Primary Literature
- Additional Readings
Precipitation that incorporates anthropogenic acids and acidic materials. Acid precipitation, strictly defined, contains a greater concentration of hydrogen (H+) ions than of hydroxyl (OH−) ions, resulting in a solution pH less than 7. Under this definition, nearly all precipitation is acidic. The phenomenon of acid deposition, however, is generally regarded as resulting from human activity (Fig. 1). See also: Precipitation (meteorology)
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