['Air Programs']
['Air Quality']
02/24/2022
...
(a) An area designated nonattainment for the 1997 8-hour NAAQS will be classified in accordance with section 181 of the CAA, as interpreted in §51.903(a), for purposes of the 1997 8-hour NAAQS, and will be subject to the requirements of subpart 2 that apply for that classification.
(b) [Reserved]
[77 FR 28841, May 14, 2012]
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