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The Identification of Violation Areas for
the 8-Hour 1997 Ozone Standard

On April 15, 2004, EPA announced that there were 474 counties that were identified as nonattainment for the 1997 8-hour standard. On June 20, 2017, the EPA announced the number of nonattainment counties for the 1997 standard at 176. Maps are available to inspect the current nonattainment areas.

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