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United States. Environmental Protection Agency. Region IX
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Shapefile
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California. Air Resources Board
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Public
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Climatology, Meteorology and Atmosphere
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1. Particulate Matter (PM-10): Federal Area Designations: California, 2011
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.