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United States. Bureau of Transportation Statistics. United States. Department of Transportation. Research and Innovative Technology Administration. United States. Federal Highway Administration.. United States. Environmental Protection Agency.. (). United States Non-Attainment Areas: Carbon Monoxide, 2013. [Shapefile]. Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS). Retrieved from https://geo.nyu.edu/catalog/sde-columbia-ntad_2013_co_1990naaqs