# Approval and Promulgation of Air Quality Implementation Plans; Indiana
> **Rule** · Direct final rule. · Published 2009-12-28 · Effective 2010-02-26 · 74 FR 68541
## Document
- **Document number:** E9-30406
- **Category:** air-emissions
- **Federal Register citation:** 74 FR 68541
- **CFR reference:** 40 CFR 52
- **Publication date:** 2009-12-28
- **Effective date:** 2010-02-26
- **State:** IN
- **EPA docket:** EPA-R05-OAR-2008-0515
## Abstract

Indiana has requested that EPA approve as revisions to its State Implementation Plan (SIP) both its continuous emission monitoring rule and alternative monitoring requirements for Alcoa Power Generating, Inc.--Warrick Power Plant. The alternative monitoring requirements allow the use of a particulate matter (PM) continuous emissions monitoring system (CEMS) in place of a continuous opacity monitor system (COMS).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/12/28/E9-30406/approval-and-promulgation-of-air-quality-implementation-plans-indiana)
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