The Trump administration announced Thursday it will end summertime smog restrictions on gasoline two weeks early in an effort to reduce fuel prices. The Environmental Protection Agency (EPA) issued a waiver allowing the sale of gasoline with a higher evaporation potential to begin on Sept. 1, rather than the middle of the month as usually required by federal regulation.
Under the Clean Air Act, the sale of gasoline with higher volatility is restricted during summer months because heat causes such fuel to evaporate more easily, contributing to the formation of smog. The EPA stated that lifting these restrictions early is intended to stabilize the gasoline supply chain amid price fluctuations.
According to AAA, the average price for a gallon of gasoline in the United States was $4.10 on Thursday. EPA Administrator Lee Zeldin stated that the waiver would increase the national gasoline supply by "hundreds of thousands" of barrels per day. The move follows volatility in oil shipping through the Strait of Hormuz due to the ongoing war in Iran.
The concrete day-to-day change for consumers will be the availability of winter-blend gasoline starting Sept. 1. While the administration describes this as a measure to "fortify our gasoline supply chain," the technical change involves using fuel with a higher evaporation potential. In terms of scale, the added supply represents a significant portion of daily U.S. needs, though the exact impact on the $4.10 per gallon price point will depend on how quickly the supply chain absorbs the additional barrels.
The decision sets a precedent for using environmental waivers to respond to geopolitical conflicts, specifically the war in Iran and its impact on the Strait of Hormuz chokepoint. By moving the transition date from mid-September to Sept. 1, the EPA is bypassing two weeks of standard smog-prevention protocols. The waiver officially takes effect on Sept. 1, 2026, across the United States.