40 C.F.R. § 51.1101
Applicability of part 51.
Cite as 40 C.F.R. § 51.1101 (2026)
The provisions in subparts A-X of part 51 apply to areas for purposes of the 2008 NAAQS to the extent they are not inconsistent with the provisions of this subpart.
40 C.F.R. § 51.1101
Cite as 40 C.F.R. § 51.1101 (2026)