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Pollution Standards Index


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(PSI)

A system developed by the US Environmental Protection Agency for measuring pollution levels for the major air pollutants that are regulated under the Clean Air Act, based on the health effects of several pollutants. It ranges from 0 (healthy) to 500 (extremely unhealthy). In 1999 the PSI was replaced by the Air Quality Index (AQI).

Subjects: Environmental Science.


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