You searched for: Subject Boundaries Remove constraint Subject: Boundaries Subject Pollution Remove constraint Subject: Pollution Place United States Remove constraint Place: United States Place Washington (D.C.) Remove constraint Place: Washington (D.C.) Format Shapefile Remove constraint Format: Shapefile Year 2006 Remove constraint Year: 2006
2006. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the particulate... United States. Bureau of Transportation Statistics.