40 CFR §51.1102 — Classification and nonattainment area planning provisions.
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
An area designated nonattainment for the 2008 ozone NAAQS will be classified in accordance with CAA section 181, as interpreted in § 51.1103(a), and will be subject to the requirements of subpart 2 of part D of title I of the CAA that apply for that classification.