On July 15, the Sierra Club filed a petition for review July 15 in the U.S. Court of Appeals for the District of Columbia Circuit challenging the EPA’s decision to delay the effective dates of rules setting air pollution standards for major source boilers and solid waste incinerators. Even though the agency is under court order to release rules by February 2011, in June the agency said it would propose revised air pollution standards for major source boilers, area source boilers, and solid waste incinerators by October and will finalize the rules by April 2012.