---
kind: "section"
citation: "40 C.F.R. § 52.1391"
title: "40"
number: "52.1391"
heading: "Emission inventories."
url: "https://uscodex.org/cfr/40/52.1391"
---

# §52.1391. Emission inventories.

- (a) The Governor of the State of Montana submitted the 1990 carbon monoxide base year emission inventories for Missoula and Billings on July 18, 1995, as a revision to the State Implementation Plan (SIP). The Governor submitted the 1990 carbon monoxide base year emission inventory for Great Falls on April 23, 1997, as a revision to the SIP. The inventories address emissions from point, area, on-road mobile, and non-road sources. These 1990 base year carbon monoxide inventories satisfy the nonattainment area requirements of the Clean Air Act of [section 187(a)(1)](/cfr/40/187.md?p=a-1) for Missoula and [section 172(c)(3)](/cfr/40/172.md?p=c-3) for Billings and Great Falls.
- (b) As part of the Thompson Falls Air Pollution Control Plan (approved at [§ 52.1370(c)(60)](/cfr/40/52.1370.md?p=c-60)), the Governor of Montana submitted a PM-10 emission inventory for the Thompson Falls area as a SIP revision. The PM-10 emission inventory covers the time period of July 1, 1990 through June 30, 1991.

## Notes

### Amendments

[62 FR 65616, Dec. 15, 1997, as amended at 69 FR 3012, Jan. 22, 2004]

### Authority

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

### Amendments

[40 FR 5521, Feb. 6, 1975]

### Amendments

[62 FR 65616, Dec. 15, 1997, as amended at 69 FR 3012, Jan. 22, 2004]