acid precipitation

noun
meteorological precipitation that is relatively acidic.
Compare acid rain.


Origin:
1975–80

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
acid precipitation  
Any form of precipitation, including rain, snow, hail, fog, or dew, that is high in acid pollutants, especially sulfuric and nitric acid. Acid precipitation has a pH of less than 5.6 (the normal acidity of unpolluted atmospheric water) and is often less than pH 5.0. Also called acid rain. See Note at acid deposition.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Acid precipitation has become one of the major environmental problems of this decade.
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