Areas with a Maintenance Plan Requirement Under Section 110(a)(1) of the CAA
As of June 15, 2005
The 1-Hour Ozone standard, as well as designations and classifications for all 1-Hour Ozone nonattainment and maintenance areas, have been revoked except for the Greensboro, NC, Nashville, TN, and Denver, CO maintenance areas.
The Kansas City, MO-KS area has a sub-marginal classification. 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. These classifications are either the nonattainment or maintenance classifications as of June 14, 2004.
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 The 1-Hour standard was revoked for the EAC areas on April 15, 2009, one year after the effective date (April 15, 2008) of their designation as attainment for the 8-Hour Ozone standard.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.