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"There is nothing affordable or clean about coal," Connecticut Attorney General William Tong said.
New York Attorney General Letitia James said the companies tried to "pollute their way to the bank."
U.S. District Judge Warren Eginton faulted the agency for violating the Clean Air Act by not responding to the petition within a 60-day time limit.
Volkswagen admitted in September that millions of its four-cylinder diesel cars were fitted with technology that cheated emissions tests.