Approval and Promulgation of One-Year Extension for Attaining the 1997 8-Hour Ozone Standard for the New Jersey Portion of the Philadelphia-Wilmington-Atlantic City Moderate Nonattainment Area

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Under the Clean Air Act, EPA is proposing to approve an extension from June 15, 2010 to June 15, 2011 of the applicable attainment date for the New Jersey portion of the Philadelphia- Wilmington-Atlantic City 1997 8-hour ozone nonattainment area (Philadelphia Area), which is classified as moderate nonattainment for the 1997 8-hour ozone national ambient air quality standard (NAAQS). This proposed extension is based in part on complete, quality-assured air quality data recorded during the 2009 ozone season. In accordance with requirements for a 1-year extension, the Philadelphia Area's 4th highest daily 8-hour monitored ozone value during the 2009 ozone season at each monitor in the area is less than 0.084 parts per million (ppm). If EPA finalizes this proposed approval of the attainment date extension, EPA will revise the table with regard to the 8-hour ozone attainment dates for the New Jersey portion of the Philadelphia Area.