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Start Over You searched for: Year 2010 Remove constraint Year: 2010 Place United States Remove constraint Place: United States Subject Air quality—Standards Remove constraint Subject: Air quality—Standards

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2010. 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 sulfur diox... United States. Bureau of Transportation Statistics.