# Approval and Promulgation of Air Quality Implementation Plans; Montana; Revised Format for Materials Being Incorporated by Reference for Montana
> **Rule** · Final rule; administrative change. · Published 2015-04-24 · Effective 2015-04-24 · 80 FR 22909
## Document
- **Document number:** 2015-09414
- **Category:** air-emissions
- **Federal Register citation:** 80 FR 22909
- **CFR reference:** 40 CFR 52
- **Publication date:** 2015-04-24
- **Effective date:** 2015-04-24
- **State:** MT
- **EPA docket:** EPA-R08-OAR-2015-0158
## Abstract

The Environmental Protection Agency (EPA) is revising the format of materials submitted by the state of Montana that are incorporated by reference (IBR) into its State Implementation Plan (SIP). The regulations affected by this format change have all been previously submitted by Montana and approved by the EPA.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2015/04/24/2015-09414/approval-and-promulgation-of-air-quality-implementation-plans-montana-revised-format-for-materials)
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