# Air Plan Approval; Montana; 2015 Ozone NAAQS Interstate Transport Requirements
> **Rule** · Final rule. · Published 2022-04-12 · Effective 2022-05-12 · 87 FR 21578
## Document
- **Document number:** 2022-07406
- **Category:** air-emissions
- **Federal Register citation:** 87 FR 21578
- **CFR reference:** 40 CFR 52
- **Publication date:** 2022-04-12
- **Effective date:** 2022-05-12
- **State:** MT
- **EPA docket:** EPA-R08-OAR-2021-0678
## Abstract

The Environmental Protection Agency (EPA) is approving a revision submitted by the State of Montana as meeting the Clean Air Act (CAA) requirement that each State Implementation Plan (SIP) contain adequate provisions to prohibit emissions that will significantly contribute to nonattainment or interfere with maintenance of the 2015 ozone National Ambient Air Quality Standards (NAAQS) in any other state. EPA is taking this action pursuant to the CAA.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2022/04/12/2022-07406/air-plan-approval-montana-2015-ozone-naaqs-interstate-transport-requirements)
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