The United States Environmental Protection Agency (EPA) has approved a temporary waiver for the sale of E15, a higher-ethanol gasoline blend, which is typically prohibited during warm weather due to concerns that it could worsen smog. The waiver, which covers May 1 through May 20, aims to bring down fuel prices at the pump. While some states have been approved to sell E15 year-round, the higher blend is typically banned during warmer months. However, critics argue that the higher ethanol concentration could negatively impact older vehicles, boats and all-terrain vehicles.