The U.S. Court of Appeals for the District of Columbia Circuit denied a petition to review the Environmental Protection Agency’s approval of interpollutant transfers of HCFCs January 22. Honeywell International and DuPont challenged four occasions in which the agency approved the transfer of allowances by their competitors, thus increasing competitor baseline allowances under a federal cap and trade market and reducing the market share and allowances for them; the two could request a rehearing.