40 CFR § 51.1119
Applicability
June 9, 2020
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.
[80 FR 12314, Mar. 6, 2015]
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