You searched for: Author United States. Environmental Protection Agency. Remove constraint Author: United States. Environmental Protection Agency. Subject United States. Clean Air Act Remove constraint Subject: United States. Clean Air Act Subject Air quality management Remove constraint Subject: Air quality management Subject Health Remove constraint Subject: Health Place California Remove constraint Place: California Data type Polygon Remove constraint Data type: Polygon Year 2011 Remove constraint Year: 2011
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.