# Air Plan Approval; OR; Update to Materials Incorporated by Reference
> **Rule** · Final rule; administrative change. · Published 2025-08-07 · Effective 2025-08-07 · 90 FR 38009
## Document
- **Document number:** 2025-14971
- **Category:** other
- **Federal Register citation:** 90 FR 38009
- **CFR reference:** 40 CFR 52
- **Publication date:** 2025-08-07
- **Effective date:** 2025-08-07
- **EPA docket:** EPA-R10-OAR-2024-0480
## Abstract

The Environmental Protection Agency (EPA) is updating the materials that are incorporated by reference (IBR) into the Oregon State Implementation Plan (SIP). The regulations affected by this update have been previously submitted by Oregon and approved by the EPA. In this final rule, the EPA is also notifying the public of corrections and clarifying changes in the Code of Federal Regulations (CFR) tables that identify the materials incorporated by reference into the Oregon SIP. This update affects the materials that are available for public inspection at the National Archives and Records Administration (NARA) and the EPA Regional Office.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/08/07/2025-14971/air-plan-approval-or-update-to-materials-incorporated-by-reference)
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