Someday an intrepid reporter should investigate the origin of these NOx emission standards, how they apply differently to cars and trucks in America, and who were the characters behind it all. Sure, cheating is bad, and many kinds of pollution are bad, but we used to be mainly concerned with carbon emissions. There is some political intrigue waiting to be uncovered, and I won't be surprised if some of the people involved in making the standards are now caught up among the cheaters.