# Disapproval of Air Quality Implementation Plans; Montana; Maintenance of Air Pollution Control Equipment for Existing Aluminum Plants
> **Rule** · Final rule. · Published 2006-01-30 · Effective 2006-03-01 · 71 FR 4822
## Document
- **Document number:** 06-789
- **Category:** air-emissions
- **Federal Register citation:** 71 FR 4822
- **CFR reference:** 40 CFR 52
- **Publication date:** 2006-01-30
- **Effective date:** 2006-03-01
- **State:** MT
- **EPA docket:** EPA-R08-OAR-2006-0017
## Abstract

EPA is disapproving a State Implementation Plan revision submitted by the State of Montana on January 16, 2003. If approved, this revision would exempt existing aluminum plants from meeting emission requirements during scheduled maintenance. This action is being taken under section 110 of the Clean Air Act.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/01/30/06-789/disapproval-of-air-quality-implementation-plans-montana-maintenance-of-air-pollution-control)
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