---
kind: "section"
citation: "40 C.F.R. § 52.2178"
title: "40"
number: "52.2178"
heading: "Significant deterioration of air quality."
url: "https://uscodex.org/cfr/40/52.2178"
---

# §52.2178. Significant deterioration of air quality.

- (a) The South Dakota plan, as submitted, is approved as meeting the requirements of part C, [subpart 1](/cfr/40/subpart1.md) of the CAA, except that it does not apply to sources proposing to construct on Indian reservations;
- (b) **Regulations for preventing significant deterioration of air quality.** The provisions of [§ 52.21](/cfr/40/52.21.md) except paragraph (a)(1) are hereby incorporated and made a part of the South Dakota State implementation plan and are applicable to proposed major stationary sources or major modifications to be located on Indian reservations.

## Notes

### Amendments

[43 FR 26410, June 19, 1978, as amended at 45 FR 52741, Aug. 7, 1980; 59 FR 47261, Sept. 15, 1994; 68 FR 11324, Mar. 10, 2003; 68 FR 74490, Dec. 24, 2003; 72 FR 72621, Dec. 21, 2007]

### Authority

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

### Amendments

[40 FR 5521, Feb. 6, 1975]

### Amendments

[43 FR 26410, June 19, 1978, as amended at 45 FR 52741, Aug. 7, 1980; 59 FR 47261, Sept. 15, 1994; 68 FR 11324, Mar. 10, 2003; 68 FR 74490, Dec. 24, 2003; 72 FR 72621, Dec. 21, 2007]