# Air Plan Approval; Utah; Interstate Transport of Air Pollution for the 2008 8-Hour Ozone National Ambient Air Quality Standard
> **Rule** · Final rule. · Published 2025-11-10 · Effective 2025-12-10 · 90 FR 50742
## Document
- **Document number:** 2025-19824
- **Category:** air-emissions
- **Federal Register citation:** 90 FR 50742
- **CFR reference:** 40 CFR 52
- **Publication date:** 2025-11-10
- **Effective date:** 2025-12-10
- **State:** UT
- **EPA docket:** EPA-R08-OAR-2025-0054
## Abstract

The Environmental Protection Agency (EPA) is approving a portion of a Utah State Implementation Plan (SIP) submission addressing interstate transport for the 2008 8-hour ozone national ambient air quality standard (NAAQS). The "interstate transport" provision requires that each state's SIP contain adequate provisions to prohibit emissions from within the state from significantly contributing to nonattainment or interfering with maintenance of the NAAQS in other states. In this action, the EPA is only addressing the requirement prohibiting interference with maintenance, referred to as "prong 2," for the 2008 ozone NAAQS.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/11/10/2025-19824/air-plan-approval-utah-interstate-transport-of-air-pollution-for-the-2008-8-hour-ozone-national)
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