The U.S. Environmental Protection Agency said Wednesday that it would temporarily allow widespread sales of a higher ethanol gas blend in a move that they hope will tamp down consumer prices that have soared since the Iran war began.

The sale of E15 is typically discontinued in the summer because it can contribute to harmful air pollution.

Not all are convinced the move will substantially lower gas prices. E15 isn’t available in all states and some places don’t have the necessary infrastructure or enough of a supply of ethanol to ramp up use, said Kenneth Gillingham, a professor at the Yale School of the Environment who studies the impacts of transportation regulations on prices, emissions and consumer welfare.