# 2026-12551: EPA Backs Arizona Cleaner Gasoline Program Changes

2026-12551, Approval and Promulgation of Implementation Plans; Arizona; Revisions to the Cleaner Burning Gasoline, Winter Oxygenated Fuel, and Gasoline Set-Aside Programs, is a Federal Register proposed rule from Environmental Protection Agency published 2026-06-23, effective Comments must be received on or before July 23, 2026.; PRIA reads it as touching household money (as of 2026-06-30).

- Canonical: https://policyrisk.com/federal-register/2026-12551
- As of: 2026-06-30
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2026-12551
- Title: Approval and Promulgation of Implementation Plans; Arizona; Revisions to the Cleaner Burning Gasoline, Winter Oxygenated Fuel, and Gasoline Set-Aside Programs
- Type: Proposed Rule
- Agencies: Environmental Protection Agency
- Citation: 91 FR 37366
- Published: 2026-06-23
- Effective: Comments must be received on or before July 23, 2026.
- Comments close: 2026-07-23
- Significant: no
- Touches household money: yes
- Regulation identifier numbers: none
- Last updated: 2026-06-30

## In one line

EPA Backs Arizona Cleaner Gasoline Program Changes

## Summary

The EPA wants to approve Arizona’s updates to cleaner gasoline and winter fuel rules that help cut pollution in Phoenix and Tucson. They’re also getting rid of an old gasoline program in parts of Maricopa and Pima counties. These changes won’t cost extra or add new rules, and folks have until July 23, 2026, to share their thoughts.

## Abstract

The Environmental Protection Agency (EPA) is proposing to approve a revision to the Arizona State Implementation Plan (SIP) submitted by the Arizona Department of Environmental Quality (ADEQ). This revision includes statutes and regulations amending the Cleaner Burning Gasoline (CBG) program, which is a control measure in the greater Phoenix metropolitan area to reduce emissions of ozone-forming pollutants, carbon monoxide (CO), and particulate matter. Additionally, this revision addresses the Winter Oxygenated Fuel program to control CO emissions in the Tucson area. Finally, this revision repeals the Arizona Gasoline Set[hyphen]aside (GSA) Program, applicable to the 1971 carbon monoxide nonattainment area covering Maricopa County and a portion of Pima County. The EPA is proposing to approve this SIP revision under the Clean Air Act (CAA or "Act"). This SIP revision is administrative in nature. This action proposes to update the existing SIP-approved CBG program with revisions that have been adopted and implemented by the State to clarify requirements, update references, and enhance flexibility of the program, and it will not impose any additional costs or regulatory burdens. We are taking comments on this proposal and plan to follow with a final action.

## Effects PRIA read

- EPA proposes approval of Arizona CBG updates: benefit, medium. The EPA is proposing to approve Arizona's revisions to its Cleaner Burning Gasoline (CBG) program (submitted June 17, 2021 with supplements in 2025). The agency says these revisions are administrative, clarify requirements, and enhance program flexibility to reduce ozone, carbon monoxide, and parti…
- New fuel testing and additive flexibilities: benefit, low. Arizona's SIP revision allows specific technical changes such as permitting isobutanol as a fuel additive, using the CARBOB model as an alternative testing method, adjustments to Reid Vapor Pressure (RVP) outside the summer ozone season, limits on MTBE, allowances for third-party terminals to blend…
- Removal of Arizona Gasoline Set-Aside program: benefit, low. The EPA is proposing to approve Arizona's repeal and removal of the Gasoline Set-Aside (GSA) program from the SIP for the 1971 carbon monoxide nonattainment area covering Maricopa County and a portion of Pima County. The EPA states this change is administrative, will be incorporated into the federa…

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## Sources
- [2026-12551 on federalregister.gov](https://www.federalregister.gov/documents/2026/06/23/2026-12551/approval-and-promulgation-of-implementation-plans-arizona-revisions-to-the-cleaner-burning-gasoline)
- [2026-12551 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2026-06-23/pdf/2026-12551.pdf)

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Source: PRIA, https://policyrisk.com/federal-register/2026-12551 (as of 2026-06-30).