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Pacific Southwest, Region 9

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

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Pacific Southwest
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Air Quality Analysis

Air Quality Trends

Air Quality Trends Home

Carbon Monoxide (CO)

Nitrogen Dioxide (NO₂)

1-Hour Ozone (O₃)

8-Hour Ozone (O₃)

24-Hour Fine Particulate Matter (PM2.5)

Annual Fine Particulate Matter (PM2.5)

Particulate Matter (PM10)

24-Hour Sulfur Dioxide (SO₂)

Annual Sulfur Dioxide (SO₂)

Air Quality Trends (1970-2011)

Sulfur Dioxide Concentrations

National 24-hour Standard
Second Highest 24-hour Average Concentration

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Graph showing air pollution concentrations for sulfur dioxide - Click for readable PDF

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