EPA Tweaks Arizona's Cleaner-Burning Gasoline and Winter Fuel Rules
Published Date: 10/19/2026
Rule
Summary
The EPA is approving updates to Arizona’s air quality plans that clean up gasoline rules in Phoenix and Tucson. These changes make the Cleaner Burning Gasoline and Winter Oxygenated Fuel programs clearer and more flexible, while getting rid of an old gasoline set-aside program. The updates start November 18, 2026, and won’t cost anyone extra or add new rules.
Analyzed Economic Effects
6 provisions identified: 6 benefits, 0 costs, 0 mixed.
Cleaner Burning Gasoline rules updated
The EPA approved Arizona updates to the Cleaner Burning Gasoline (CBG) program that apply in the greater Phoenix area. The revisions clarify requirements, update references, and add flexibility, and the EPA says they will not impose any additional costs or regulatory burdens; the approval is effective November 18, 2026.
Winter Oxygenated Fuel program approved for Tucson
The EPA approved Arizona revisions to the Winter Oxygenated Fuel program that control carbon monoxide (CO) emissions in the Tucson area. The approval is effective November 18, 2026, and the rule states these revisions are administrative and will not add costs or regulatory burdens.
Gasoline Set-Aside (GSA) Program repealed
The EPA approved Arizona's repeal of the Arizona Gasoline Set-aside (GSA) Program that applied to the 1971 carbon monoxide nonattainment area covering Maricopa County and a portion of Pima County. The SIP revisions (including this repeal) are incorporated by reference and become federally effective and enforceable as of November 18, 2026.
CBG program reduces air pollutants
The CBG program is a control measure in the greater Phoenix area intended to reduce ozone-forming pollutants, carbon monoxide, and particulate matter. The EPA approved the State's revised CBG statutes and regulations into the SIP, effective November 18, 2026.
SIP materials become federally enforceable
The EPA incorporated by reference the listed Arizona statutes and rules into the SIP, and states they are fully federally enforceable under Clean Air Act sections 110 and 113 as of the November 18, 2026 effective date.
SIP approvals exclude Indian reservation lands
The EPA states this SIP approval is not approved to apply on any Indian reservation land or in other areas where an Indian Tribe has jurisdiction. The rule therefore does not have Tribal implications or impose substantial direct costs on Tribal governments with jurisdiction.
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