Pollutant Standards Index (PSI) 2
Pollutant Standards Index (PSI) 2 :
A numerical index formerly used for reporting severity of air pollution levels to the general public. The PSI incorporated the five criteria pollutants - ozone, PM10, carbon monoxide, sulfur dioxide and nitrogen dioxide - into one single index. The PSI was based on the 1-hour ozone standard. PSI levels ranged from 0 (Good air quality) to 500 (Hazardous air quality). The higher the index, the higher the level of pollutants and the greater likelihood of health effects. For more information, see our Air Quality Index werbsite
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