In the last two weeks, Volkswagen has admitted that it sold 11 million cars with so-called “Clean Diesel” engines worldwide that were equipped with software allowing them to cheat emissions tests. Below are five things you need to know: What did Volkswagen do? Independent automobile researchers report that Volkswagen sold 11 million diesel cars that produced as much as 40 times the E.P.A. allowed limit of nitrogen oxide, a pollutant that contributes to respiratory problems including asthma, bronchitis, and emphysema. . . . Continue Reading