Acid rain is any form of precipitation with elevatedacidiccomponents. This includes rain, snow, fog, or dust.

The major contributors (precursors) to acid rain are the common air pollutants: Sulfur dioxide (SO₂) and nitrogen oxides (NO_X), nitric oxide (NO) and nitrogen dioxide (NO₂). The wind can blow SO₂and NO_X长距离,fo酸雨问题r everyone, not just for people who live near the source.

Acid rain generally has little environmental effect because it is rapidly neutralized after it falls. For areas that have a limited capability of neutralizing acid rain, its impact is harmful. Acid rain may corrode the gills of fish, attack their calcium carbonate skeleton, and leaches the nutrients in the soil.