# Air Plan Approval; Montana; Revisions to Western Sugar Stipulation
> **Rule** · Final rule. · Published 2026-05-14 · Effective 2026-06-15 · 91 FR 27209
## Document
- **Document number:** 2026-09619
- **Category:** air-emissions
- **Federal Register citation:** 91 FR 27209
- **CFR reference:** 40 CFR 52
- **Publication date:** 2026-05-14
- **Effective date:** 2026-06-15
- **State:** MT
- **EPA docket:** EPA-R08-OAR-2025-2070
## Abstract

The Environmental Protection Agency (EPA) is approving revisions to the Montana State Implementation Plan (SIP). These revisions specifically address sulfur dioxide (SO<INF>2</INF>) emission limits and associated requirements related to the Western Sugar Cooperative facility in Billings, Montana. The EPA is taking this action pursuant to the Clean Air Act (CAA).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2026/05/14/2026-09619/air-plan-approval-montana-revisions-to-western-sugar-stipulation)
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