§52.221. Classification of regions.
40 C.F.R. § 52.221
The California plan was evaluated on the basis of the following classifications:
Notes, amendments, and revision history
Amendments
[86 FR 16537, Mar. 30, 2021]
Authority
Authority: 42 U.S.C. 7401 et seq.
Amendments
[40 FR 5521, Feb. 6, 1975]
Amendments
[86 FR 16537, Mar. 30, 2021]