United States Non-Attainment Areas: Carbon Monoxide, 2013
- 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.
- Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS)
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- More details at
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