Ohio’s Supreme Court on Tuesday cleared the way for the state’s attorney general to move forward with a lawsuit against Volkswagen AG over its “Dieselgate” scandal and manipulation of emissions-control systems. The court ruled 6–1 that the federal Clean Air Act did not pre-empt state law-based claims that Ohio Attorney General Dave Yost is pursuing, or prohibit state oversight after a vehicle or engine is sold. “This is a major decision that will ensure that Volkswagen can be held accountable,” Yost said in a statement. VW promised an appeal to the U.S. Supreme Court, saying the decision could create “regulatory chaos” and inhibit the U.S. Environmental Protection Agency’s ability to regulate emissions by giving state and local governments overlapping authority. The German automaker has agreed to pay more than $25 billion in the United States for claims from owners, environmental regulators, states, and dealers, and offered to buy back about …