# Air Plan Partial Approval and Partial Disapproval; Utah; Regional Haze State Implementation Plan for the Second Implementation Period; Air Plan Disapproval; Utah; Prong 4 (Visibility) for the 2015 8-Hour Ozone National Ambient Air Quality Standard
> **Rule** · Final rule. · Published 2024-12-02 · Effective 2025-01-02 · 89 FR 95117
## Document
- **Document number:** 2024-27941
- **Category:** air-emissions
- **Federal Register citation:** 89 FR 95117
- **CFR reference:** 40 CFR 52
- **Publication date:** 2024-12-02
- **Effective date:** 2025-01-02
- **State:** UT
- **EPA docket:** EPA-R08-OAR-2024-0389
## Abstract

The Environmental Protection Agency (EPA) is partially approving and partially disapproving a regional haze state implementation plan (SIP) revision submitted by the State of Utah on August 2, 2022 (Utah's regional haze SIP submission), to address applicable requirements under the Clean Air Act (CAA) and the EPA's Regional Haze Rule (RHR) for the regional haze program's second implementation period. Additionally, the EPA is disapproving the visibility transport "Prong 4" portion of Utah's infrastructure SIP submission submitted on January 9, 2020, for the 2015 Ozone National Ambient Air Quality Standard (NAAQS). The EPA is taking these actions pursuant to the CAA.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2024/12/02/2024-27941/air-plan-partial-approval-and-partial-disapproval-utah-regional-haze-state-implementation-plan-for)
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