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Acid Attack

Graphic showing mechanism of acid deposition

Some human-created air pollutants form acids which come down either as dry fallout, or as rain, snow, fog and cloud water. This fallout raises the acidity level of lakes, streams and soils, injuring life in the water and causing chemical inbalances in plants. Because the waters and soils of the Sierra aren't able to neutralize acids very well, they are sensitive to both wet and dry acidic fallout.

Mountain stream

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  Air Transport Corridors

  Pollution Sources

  Criteria Pollutants



  Acid Rain/Snow

Trees damaged by acid deposition 

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