# Air Plan Approval; South Dakota; Regional Haze Plan for the Second Implementation Period
> **Rule** · Final rule. · Published 2025-08-28 · Effective 2025-09-29 · 90 FR 41893
## Document
- **Document number:** 2025-16468
- **Category:** air-emissions
- **Federal Register citation:** 90 FR 41893
- **CFR reference:** 40 CFR 52
- **Publication date:** 2025-08-28
- **Effective date:** 2025-09-29
- **State:** SD
- **EPA docket:** EPA-R08-OAR-2024-0609
## Abstract

The Environmental Protection Agency (EPA) is approving a regional haze state implementation plan (SIP) revision submitted by the State of South Dakota on July 29, 2022 (South Dakota's 2022 SIP submission), as satisfying applicable requirements under the Clean Air Act (CAA) and the EPA's Regional Haze Rule (RHR) for the program's second implementation period. The EPA is taking this action pursuant to CAA.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/08/28/2025-16468/air-plan-approval-south-dakota-regional-haze-plan-for-the-second-implementation-period)
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