California and 17 other states are suing the Environmental Protection Agency for its planned rollback of Obama-era standards on vehicle emissions, according to a press release from Gov. Jerry Brown (D-CA). The states suing represent 43 percent of the American auto market. “Today’s lawsuit, which was filed in the United States Court of Appeals for the District of Columbia Circuit, seeks to set aside and hold unlawful the U.S. EPA’s effort to weaken the existing clean car rules,” the release says. “The lawsuit is based on the fact that the U.S. EPA acted arbitrarily and capriciously, failed to follow its own regulations and violated the Clean Air Act.” The agency “offered no evidence to support” the decision to scrap the 2022-2025 designated rules, the release says. California is leading the coalition, which includes the District of Columbia, New Jersey, New York, Pennsylvania, Virginia, and Washington.