1. LawStack
  2. Title 40 - Protection of Environment
  3. Chapter I - ENVIRONMENTAL PROTECTION AGENCY
  4. Subchapter C - AIR PROGRAMS
  5. Part 51 - REQUIREMENTS FOR PREPARATION, ADOPTION, AND SUBMITTAL OF IMPLEMENTATION PLANS
  6. Subpart X - Provisions for Implementation of 8-hour Ozone National Ambient Air Quality Standard
  7. 40 CFR § 51.906
40 CFR § 51.906
Redesignation to nonattainment following initial designations for the 8-hour NAAQS
June 9, 2020
CFR

For any area that is initially designated attainment or unclassifiable for the 8-hour NAAQS and that is subsequently redesignated to nonattainment for the 8-hour ozone NAAQS, any absolute, fixed date applicable in connection with the requirements of this part is extended by a period of time equal to the length of time between the effective date of the initial designation for the 8-hour NAAQS and the effective date of redesignation, except as otherwise provided in this subpart.

[70 FR 71700, Nov. 29, 2005]

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§ 51.905 How do areas transition from the 1-hour NAAQS to the 1997 8-hour NAAQS and what are the anti-backsliding provisions?
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§ 51.907 For an area that fails to attain the 8-hour NAAQS by its attainment date, how does EPA interpret sections 172(a)(2)(C)(ii) and 181(a)(5)(B) of the CAA?

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