You searched for: Author United States. Environmental Protection Agency. Remove constraint Author: United States. Environmental Protection Agency. Access Public Remove constraint Access: Public Subject United States. Clean Air Act Remove constraint Subject: United States. Clean Air Act Subject Health Remove constraint Subject: Health 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.