§51.905. How do areas transition from the 1-hour NAAQS to the 1997 8-hour NAAQS and what are the anti-backsliding provisions? — Inbound Citations

As of revocation of the 1997 ozone NAAQS on April 6, 2015, as set forth in § 50.10(c), the provisions of subpart AA shall replace the provisions of subpart X, §§ 51.900 to 51.918, which cease to apply except for § 51.907 for the anti-backsliding purposes of § 51.1105(c)(2). See subpart X§ 51.919.

As of April 6, 2015, the provisions of subpart AA shall replace the provisions of subpart X, §§ 51.900 to 51.918, which will cease to apply, with the exception of the attainment date extension provisions of § 51.907 for the anti-backsliding purposes of § 51.1105(d)(2).

(13) Attainment demonstration or an alternative as provided under § 51.905(a)(1)(ii).

(f) EPA is approving a revision to the State Implementation Plan submitted by the Maine Department of Environmental Protection on June 9, 13, and 14, 2005. The revision is for purposes of satisfying the 5 percent increment of progress requirement of 40 CFR 51.905(a)(1)(ii)(B) for the Portland Maine eight-hour ozone nonattainment area. The revision establishes motor vehicle emissions budgets for 2007 of 20.115 tons per summer day (tpsd) of volatile organic compound (VOC) and 39.893 tpsd of nitrogen oxide (NOX) to be used in transportation conformity in the Portland Maine 8-hour ozone nonattainment area.

(b) On December 19, 2007, the California Air Resources Board submitted a maintenance plan for the 1997 8-hour ozone NAAQS for the Monterey Bay Area as required by section 110(a)(1) of the Clean Air Act, as amended in 1990, and 40 CFR 51.905(a)(4). Elements of the section 110(a)(1) maintenance plan for ozone include a base year (2002) attainment emissions inventory for ozone, a demonstration of maintenance of the ozone NAAQS with projected emissions inventories through the year 2014 for ozone, a plan to verify continued attainment, and a contingency plan. The maintenance plan meets the Federal requirements of Clean Air Act section 110(a)(1) and 40 CFR 51.905(a)(4) and is approved as a revision to the California State Implementation Plan for the above mentioned area.