['Air Programs']
['Air Quality']
05/10/2024
...
(a) Any significant revision to a state or Tribal plan shall be adopted and submitted as specified in §60.28a.
(b) A revision of a plan, or any portion thereof, shall not be considered part of an applicable plan until approved by the Administrator in accordance with this subpart and subpart Ba of this part.
[89 FR 17140, Mar. 8, 2024]
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