Fourteen states, the Mississippi Public Service Commission, and the cities of Springfield, IL and Ames, IA filed a brief May 29 in opposition to a Supreme Court review of the Environmental Protection Agency cross-state air pollution rule. The group said the August 2012 U.S. Court of Appeals for the District of Columbia Circuit decision was proper because it struck down the agency’s decision to issue a federal implementation plan over the legally required state plan approach. The Supreme Court is considering the agency’s appeal.