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Nonattainment Area - 8 hr Ozone (1997)

The Nonattainment Area - 8 hr Ozone (1997) dataset is part of the U.S. Department of Transportation (USDOT)/Bureau of Transportation Statistics's (BTS's) National Transportation Atlas Database (NTAD). Non-attainment and maintenance areas for the United States and its territories. The standard for the Ozone 8-hour NAA is 0.075 ppm. For more detailed information on this dataset, see the Overview Description in the Entity Attribute section of this document.

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