Pacific Southwest, Region 9
Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations
Air Quality Analysis
Air Quality Trends
2008 Lead (Pb) National Standard
24-Hour Fine Particulate Matter (PM2.5)
Annual Fine Particulate Matter (PM2.5)
24-Hour Sulphur Dioxide (SO2)
Air Quality Trends (1973-2018)
Sulfur Dioxide Concentrations
National 24-hour Standard
Second Highest 24-hour Average Concentration
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