Rhodia Inc. filed two lawsuits May 23 challenging the Environmental Protection Agency’s new source performance standards for solid waste incinerators and an EPA rule that differentiates fuels and solid wastes. More than 40 petitions for review have been filed in the U.S. Court of Appeals for the District of Columbia Circuit against EPA regarding the two rules and three additional rules that establish air pollution standards for sewage sludge incinerators and major and area source boilers. The five rules were published March 21, but the agency intends to reconsider portions of the rules.