---
kind: "section"
citation: "40 C.F.R. § 52.221"
title: "40"
number: "52.221"
heading: "Classification of regions."
url: "https://uscodex.org/cfr/40/52.221"
---

# §52.221. Classification of regions.


The California plan was evaluated on the basis of the following classifications:


## Notes

### 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]