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Pacific Southwest, Region 9

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

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Pacific Southwest
Air
Quality Analysis
Trends
Lead Concentrations

Air Quality Analysis

Air Quality Trends

Air Quality Trends Home

Carbon Monoxide (CO)

2008 Lead (Pb) National Standard

1978 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)

1978 Lead (Pb) NAAQS Air Quality Trends (1970-2007)

Lead Concentrations

National Standard
Maximum calendar quarter mean concentration during the course of one year

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Graph showing declining air pollution concentrations for lead

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