# Approval and Promulgation of Air Quality Implementation Plans; State of Montana; Revisions to PSD Permitting Rules
> **Rule** · Final rule. · Published 2018-06-26 · Effective 2018-07-26 · 83 FR 29694
## Document
- **Document number:** 2018-13597
- **Category:** air-emissions
- **Federal Register citation:** 83 FR 29694
- **CFR reference:** 40 CFR 52
- **Publication date:** 2018-06-26
- **Effective date:** 2018-07-26
- **State:** MT
- **EPA docket:** EPA-R08-OAR-2018-0136
## Abstract

The Environmental Protection Agency (EPA) is taking final action to fully approve the State Implementation Plan (SIP) revision submitted by the State of Montana on October 14, 2016. Montana's October 14, 2016 submittal revises their prevention of significant deterioration (PSD) regulations. This action is being taken under section 110 of the Clean Air Act (CAA) (Act).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/06/26/2018-13597/approval-and-promulgation-of-air-quality-implementation-plans-state-of-montana-revisions-to-psd)
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