# Approval and Promulgation of Air Quality Implementation Plans; Indiana; CO Monitoring
> **Rule** · Direct final rule. · Published 2015-04-17 · Effective 2015-06-16 · 80 FR 21174
## Document
- **Document number:** 2015-08885
- **Category:** air-emissions
- **Federal Register citation:** 80 FR 21174
- **CFR reference:** 40 CFR 52
- **Publication date:** 2015-04-17
- **Effective date:** 2015-06-16
- **State:** IN
- **EPA docket:** EPA-R05-OAR-2014-0294
## Abstract

The Environmental Protection Agency (EPA) is approving a revision to Indiana's monitoring requirements as a revision to the State Implementation Plan (SIP). The SIP revision was submitted by Indiana to EPA on January 22, 2014. Once approved, the SIP would authorize emission units that combust sewage sludge to continuously monitor carbon monoxide emissions, consistent with Federal requirements.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2015/04/17/2015-08885/approval-and-promulgation-of-air-quality-implementation-plans-indiana-co-monitoring)
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