# Approval and Promulgation of Air Quality Implementation Plans; State of Montana; Revisions to East Helena Lead SIP
> **Rule** · Final rule. · Published 2018-03-28 · Effective 2018-04-27 · 83 FR 13196
## Document
- **Document number:** 2018-06109
- **Category:** air-emissions
- **Federal Register citation:** 83 FR 13196
- **CFR reference:** 40 CFR 52
- **Publication date:** 2018-03-28
- **Effective date:** 2018-04-27
- **State:** MT
- **EPA docket:** EPA-R08-OAR-2017-0634
## Abstract

The Environmental Protection Agency (EPA) is taking final action to approve State Implementation Plan (SIP) revisions submitted by the state of Montana on September 11, 2013. The submittal revises the portions of the State Implementation Plan (SIP) that pertain to the East Helena Lead SIP. This action is being taken under section 110 of the Clean Air Act (CAA) (Act).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/03/28/2018-06109/approval-and-promulgation-of-air-quality-implementation-plans-state-of-montana-revisions-to-east)
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