U.S. 9th Circuit Court of Appeals San Francisco, California

The California Air Resources Board has filed suit in the U.S. 9th Circuit Court of Appeals seeking a reversal of the U.S. Environmental Protection Agency's decision to deny California's request for a waiver from the federal reformulated gasoline oxygen standard.

The Agency denied California's waiver request in June, ruling the state had failed to prove that maintaining the federal oxygen standard would impede with the state's achievement of a national ambient air quality standard as required by law.