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36 FR 22398, Nov. 25, 1971, unless otherwise noted.
83 FR 10382, Mar. 9, 2018, unless otherwise noted.
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The requirements for nonattainment NSR for the ozone NAAQS are located in § 51.165. For each nonattainment area, the state shall submit a nonattainment NSR plan or plan revision for a specific ozone NAAQS no later than 36 months after the effective date of the area's designation of nonattainment or redesignation to nonattainment for that ozone NAAQS.
[83 FR 63033, Dec. 6, 2018]