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Contact Region 9

Pacific Southwest, Region 9

Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations

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Pacific Southwest
Air
Quality Analysis
Trends
Ozone Concentrations

Air Quality Analysis

Air Quality Trends

Air Quality Trends Home

Carbon Monoxide (CO)

2008 Lead (Pb) National Standard

Nitrogen Dioxide (NO₂)

8-Hour Ozone (O₃)

24-Hour Fine Particulate Matter (PM2.5)

Annual Fine Particulate Matter (PM2.5)

Particulate Matter (PM10)

24-Hour Sulphur Dioxide (SO₂)

Annual Sulphur Dioxide (SO₂)

Air Quality Trends (1976-2018)

8-Hour Ozone Concentrations

"Design Value" - National 8-hour Standard
Average of 4th Highest Days over Three Years

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Graph showing air pollution concentrations for ozone - Click to Enlarge

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About EPA Region 9 (Pacific Southwest)

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