Non-attainment and maintenance areas for the United States and its territories. The standard for the CO NAA is 9 ppm. For more detailed information on this dataset, see the Overview Description in the Entity Attribute section of this document.
Creator:
United States. Bureau of Transportation Statistics, United States. Department of Transportation. Research and Innovative Technology Administration, United States. Federal Highway Administration., and United States. Environmental Protection Agency.
Publisher:
Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS)