Paul Revere Transportation, LLC, a Boston-based bus company agreed to pay $650,000 in fines after the company was found liable of leaving its vehicles idle for long periods of time. The U.S. Environmental Protection Agency brought charges against the company in June for violating the federal Clean Air Act and local Massachusetts laws against idling vehicles. EPA inspectors found 234 different violations over a seven week period, including at times finding over 20 buses left idle for up to two hours at a time.