Science Fact Finder | The Environment - What Is The Pollutant Standard Index?

What is the Pollutant Standard Index?

The Pollutant Standard Index (PSI) is a measure of concentrations of pollutants in the air, in parts per million. It was developed by the Environmental Protection Agency (EPA) in conjunction with the South Coast Air Quality Management District of El Monte, California. PSI measurements are used to inform the public about potential health effects due to air quality. They have been in use nationwide since 1978.

PSI Index	Health Effects	Cautionary Status
0	Good
50	Moderate
100	Unhealthful
200	Very unhealthful	Alert: Elderly or ill should stay indoors and reduce physical activity.
300	Hazardous	Warning:...

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