# Air Plan Approval; AK; Updates to Materials Incorporated by Reference
> **Rule** · Final rule; administrative change. · Published 2026-02-09 · Effective 2026-02-09 · 91 FR 5686
## Document
- **Document number:** 2026-02478
- **Category:** other
- **Federal Register citation:** 91 FR 5686
- **CFR reference:** 40 CFR 52
- **Publication date:** 2026-02-09
- **Effective date:** 2026-02-09
- **EPA docket:** EPA-R10-OAR-2025-3357
## Abstract

The Environmental Protection Agency (EPA) is updating the materials that are incorporated by reference (IBR) into the Alaska State Implementation Plan (SIP). The regulations affected by this update have been previously submitted by the State of Alaska and approved by the EPA. This update affects the materials that are available for public inspection at the EPA Regional Office and the National Archives and Records Administration.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2026/02/09/2026-02478/air-plan-approval-ak-updates-to-materials-incorporated-by-reference)
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