Sulfur dioxide (SO2) and nitrogen dioxide (NO2), primarily from burning fossil fuels, react with water, oxygen, and other chemicals in the atmosphere to form sulfuric acid (H2SO4) and nitric acid (HNO3). These acids dissolve in rainwater, making it acidic.
Falling rainfall becomes acidic due to the dissolution of the one of the following in air water:
Asked in RPSC RAS Prelims 1998 · Topic: Pollution (Air Pollution: Types, sources, primary & secondary pollutants, smog, acid rain, effects, control technologies & policies.)
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