# Air Plan Approval; OR; Updates to Adoption by Reference of Federal Provisions
> **Rule** · Final rule. · Published 2021-08-11 · Effective 2021-09-10 · 86 FR 43954
## Document
- **Document number:** 2021-16947
- **Category:** air-emissions
- **Federal Register citation:** 86 FR 43954
- **CFR reference:** 40 CFR 52
- **Publication date:** 2021-08-11
- **Effective date:** 2021-09-10
- **EPA docket:** EPA-R10-OAR-2021-0212
## Abstract

The Environmental Protection Agency (EPA) is approving a revision to the Oregon State Implementation Plan (SIP) submitted on January 29, 2021. The revision updates the date by which Federal provisions are adopted by reference into the Oregon SIP, making air quality requirements more current.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/08/11/2021-16947/air-plan-approval-or-updates-to-adoption-by-reference-of-federal-provisions)
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