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3. Particulate Matter (PM-10): Federal Area Designations: California, 2011

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2011. United States. Environmental Protection Agency. Region IX. This polygon shapefile shows designated areas for particulate matter < 10 microns according to the 24-Hour National Ambient Air Quality Standard... California. Air Resources Board.

4. Particulate Matter (PM-2.5) Non-Attainment Areas: California, 2011

Polygon Stanford University Public content
2011. United States. Environmental Protection Agency. . This polygon shapefile identifies areas in the U.S. where air pollution levels have not met the 2006 National Ambient Air Quality Standards (NAAQS)... California. Air Resources Board.