---
kind: "section"
citation: "40 C.F.R. § 52.1121"
title: "40"
number: "52.1121"
heading: "Classification of regions."
url: "https://uscodex.org/cfr/40/52.1121"
---

# §52.1121. Classification of regions.


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


## Notes

### Amendments

[37 FR 10872, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 45 FR 61303, Sept. 16, 1980; 84 FR 29383, June 24, 2019]

### Authority

Authority: 42 U.S.C. 7401 et seq.

### Amendments

[40 FR 5521, Feb. 6, 1975]

### Amendments

[37 FR 10872, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 45 FR 61303, Sept. 16, 1980; 84 FR 29383, June 24, 2019]