You searched for: Author United States. Environmental Protection Agency. Remove constraint Author: United States. Environmental Protection Agency. Subject Organic compounds Remove constraint Subject: Organic compounds Subject Particulate nitrate Remove constraint Subject: Particulate nitrate Place California Remove constraint Place: California Data type Polygon Remove constraint Data type: Polygon
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.