---
kind: "section"
citation: "40 C.F.R. § 52.1394"
title: "40"
number: "52.1394"
heading: "Section 110(a)(2) infrastructure requirements."
url: "https://uscodex.org/cfr/40/52.1394"
---

# §52.1394. Section 110(a)(2) infrastructure requirements.

- (a) **On December 22, 2009, David L.** Klemp, Bureau Chief, Air Resources Management Bureau, of the Montana Department of Environmental Quality submitted a certification letter which provides the State of Montana's SIP provisions which meet the requirements of CAA Section [110(a)(1)](/cfr/40/110.md?p=a-1) and [(2)](/cfr/40/110.md?p=a-2) relevant to the 1997 Ozone NAAQS.
- (b) On February 10, 2010, Brian Schweitzer, Governor, State of Montana, submitted a certification letter which provides the State of Montana's SIP provisions which meet the requirements of CAA section [110(a)(1)](/cfr/40/110.md?p=a-1) and [(2)](/cfr/40/110.md?p=a-2), elements (A), (B), (C) with respect to the requirement to have a minor NSR program that addresses PM2.5; (E)(i), (E)(iii), (F), (G), (H), (J) with respect to the requirements of sections [121](/cfr/40/121.md) and [127](/cfr/40/127.md), [(K)](/cfr/40/127.md?p=K), [(L)](/cfr/40/127.md?p=L), and [(M)](/cfr/40/127.md?p=M).
- (c) On September 26, 2018, Steve Bullock, Governor, State of Montana, submitted a certification letter which provides the State of Montana's SIP provisions which meet the requirements of CAA section [110(a)(1)](/cfr/40/110.md?p=a-1) and [(2)](/cfr/40/110.md?p=a-2) relevant to the 2015 8-hour Ozone NAAQS.

## Notes

### Amendments

[76 FR 43923, July 22, 2011, as amended at 78 FR 45866, July 30, 2013; 90 FR 51515, Nov. 18, 2025]

### Authority

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

### Amendments

[40 FR 5521, Feb. 6, 1975]

### Amendments

[76 FR 43923, July 22, 2011, as amended at 78 FR 45866, July 30, 2013; 90 FR 51515, Nov. 18, 2025]