| acid precipitation n. Precipitation abnormally high in sulfuric and nitric acid content that is caused by atmospheric pollutants. |
| 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. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  acid precipitation - rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with waterair pollution - pollution of the atmosphere; "air pollution reduced the visibility" |
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