# Air Plan Approval; Indiana; Indiana NOX Emissions Monitoring
> **Rule** · Final rule. · Published 2026-05-14 · Effective 2026-06-15 · 91 FR 27214
## Document
- **Document number:** 2026-09612
- **Category:** air-emissions
- **Federal Register citation:** 91 FR 27214
- **CFR reference:** 40 CFR 52
- **Publication date:** 2026-05-14
- **Effective date:** 2026-06-15
- **State:** IN
- **EPA docket:** EPA-R05-OAR-2021-0761
## Abstract

The Environmental Protection Agency (EPA) is approving under the Clean Air Act (CAA) a request from the Indiana Department of Environmental Management (IDEM) to revise the Indiana State Implementation Plan (SIP) to incorporate revisions to nitrogen oxides (NO<INF>X</INF>) emissions monitoring, reporting, and recordkeeping requirements for new and existing large non-Electric Generating Units (non-EGUs) affected by the NO<INF>X</INF> SIP Call. This SIP revision would approve monitoring, reporting, and recordkeeping requirements that are permissible as alternatives under Federal rules for these sources for purposes of the NO<INF>X</INF> SIP Call.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2026/05/14/2026-09612/air-plan-approval-indiana-indiana-nox-emissions-monitoring)
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