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Areas with a Maintenance Plan Requirement Under Section 110(a)(1) of the CAA
As of June 15, 2005
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The former 1-Hour Ozone designations and classifications as of June 15, 2004, are being retained in subpart C of Part 81 for purposes of the anti backsliding provisions of 40 CFR 51.905. 40 CFR 51.905(c) references subpart C of part 81 for the areas affected by the anti-backsliding regulation.
The Nashville, TN and Greensboro-Winston Salem-High Point, NC 1-Hour Ozone maintenance areas were Early Action Compact (EAC) areas. The 1-Hour standard was revoked for the EAC areas on April 15, 2009, one year after the effective date (April 15, 2008) of their designation as attainment for the 8-Hour Ozone standard. At that time, the Nashville, TN and Greensboro-Winston Salem-High Point, NC areas were required to submit a 10-year maintenance plan under section 110(a)(1) of the CAA and the Phase 1 Rule.