• In this Sept. 23, 2015 file photo, diesel Volkswagens are seen behind a security fence on a storage lot near a VW dealership in Salt Lake City. Volkswagen is far from the first company to stand accused of trying to game required emissions tests. Almost since the passage of the Clean Air Act in 1970, major manufacturers of cars, trucks and heavy equipment have been busted for using what regulators call “defeat devices” _ typically programing a vehicle’s on-board computer to boost horsepower or fuel mileage by belching out dirtier exhaust than allowed. (AP Photo/Rick Bowmer, File)

    VW the latest in long list of companies caught cheating

    WASHINGTON (AP) — In stock car racing, there’s an old adage: If you ain’t cheatin’, you ain’t tryin’. You could say the same sometimes for auto makers up against stricter environmental rules.

  • Environmental Protection Agency (EPA) Acting Assistant Administrator for Air and Radiation Janet McCabe, testifies on Capitol Hill in Washington, Tuesday, Sept. 29, 2015, before a Senate Environment and Public Works Committee hearing on “Economy-wide Implications of President Obama's Air Agenda.” Facing a court-ordered deadline, the Obama administration is preparing to finalize stricter U.S. emissions limits on smog-forming pollution linked to asthma and respiratory illness. (AP Photo/Manuel Balce Ceneta)

    EPA set to tighten smog limits as business gears for fight

    WASHINGTON (AP) — The Environmental Protection Agency announced new rules Tuesday to reduce toxic air pollution from oil refineries by forcing operators to adopt new technology that better monitors and controls emissions.