acid rain

From: A Dictionary of Weather | Date: 2001| Author: | Copyright information

acid rain A popular term for precipitation that has a low pH (potential of hydrogen) value as a result of atmospheric (particularly anthropogenic) pollutants, and which causes environmental damage. Although a neutral solution has a pH value of 7, even in pre-industrial times natural rainwater was slightly acid with a pH value of 5.6, most probably because of dissolved carbon ...

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