# Air Plan Approval; Alabama; Update to Materials Incorporated by Reference
> **Rule** · Final rule; notice of administrative change. · Published 2023-03-20 · Effective 2023-03-20 · 88 FR 16556
## Document
- **Document number:** 2023-05239
- **Category:** other
- **Federal Register citation:** 88 FR 16556
- **CFR reference:** 40 CFR 52
- **Publication date:** 2023-03-20
- **Effective date:** 2023-03-20
- **State:** AL
- **EPA docket:** EPA-R04-OAR-2021-0075
## Abstract

The Environmental Protection Agency (EPA) is updating the materials that are incorporated by reference (IBR) into the Alabama State Implementation Plan (SIP). The regulations affected by this update have been previously submitted by Alabama and approved by EPA. EPA is also notifying the public of corrections to the Code of Federal Regulations (CFR) tables that identify material incorporated by reference into the Alabama 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/2023/03/20/2023-05239/air-plan-approval-alabama-update-to-materials-incorporated-by-reference)
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