Red states won’t get a chance to fight in the high court against a Clean Air Act waiver that they say gives California outsized rights over other states.

The U.S. Supreme Court said Monday it would not make a decision petition of Ohio and other states seeking to overturn a lower court ruling that allowed the Environmental Protection Agency to reinstate a legal exemption that allows the Golden State to set its own vehicle emissions standards.

Under Section 209 of the Clean Air Act, California can establish stricter exhaust rules outside of federal regulations. Other states may also adhere to California’s standards. …