Acid-precipitation meaning

Precipitation abnormally high in sulfuric and nitric acid content that is caused by atmospheric pollutants.
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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.
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