OMAHA, Neb. (AP) — The Environmental Protection Agency cleared the way Friday for a higher blend of ethanol to be sold nationwide for the third summer in a row, citing global conflicts that it says are putting pressure on the world’s fuel supply.

The agency announced an emergency waiver that will exempt gasoline blended with 15% ethanol from an existing summertime ban. Gasoline with 10% ethanol is already sold nationwide, but the higher blend has been prohibited in the summer because of concerns it could worsen smog during warm weather.

EPA Administrator Michael Regan said the waiver was warranted because of “Russia’s unjustified, unprovoked, and unconscionable war against Ukraine” and the ongoing conflict in the Middle East, which he said are putting pressure on the global fuel supply. He said the diminished U.S. refining capacity is also a factor.