Determination of Nonattainment and Reclassification of the Dallas/Fort Worth 1997 8-hour Ozone Nonattainment Area; TX

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EPA is proposing to determine that the Dallas/Fort Worth (DFW) moderate 8-hour ozone nonattainment area did not attain the 1997 8-hour ozone national ambient air quality standard (NAAQS or standard) by June 15, 2010, the attainment deadline set forth in the Clean Air Act (CAA or Act) and Code of Federal Regulations (CFR) for moderate nonattainment areas. This proposal is based on EPA's review of complete, quality assured and certified ambient air quality monitoring data for the 2007-2009 monitoring period that are available in the EPA Air Quality System (AQS) database. If EPA finalizes this determination, the DFW area will be reclassified by operation of law as a serious 8- hour ozone nonattainment area for the 1997 8-hour standard. The serious area attainment date for the DFW area would be as expeditiously as practicable, but not later than June 15, 2013. Once reclassified, Texas must submit State Implementation Plan (SIP) revisions for the DFW area that meet the 1997 8-hour ozone nonattainment requirements for serious areas as required by the Act. In this action, EPA is also proposing that Texas submit the required SIP revisions for the serious area attainment demonstration, reas