"President Biden will announce today that his administration will temporarily allow E15 gasoline — gasoline that uses a 15 percent ethanol blend that is typically banned from sale from June to September — to be sold this summer.

The announcement comes on the day that the president is scheduled to visit an ethanol plant in the small town of Menlo, about 50 miles west of Des Moines, Iowa.

Ethanol is a fuel commonly made from corn that, under the 2005 federal Renewable Fuel Standard, is required to be blended into billions of gallons of gasoline each year.

In contrast to E10, which makes up the bulk of gasoline sold in the United States, the sale of E15 is typically banned under the Clean Air Act during the summer because of air pollution concerns."

Eric McDaniel reports for NPR April 12, 2022. [2]