Question: What started on 18 September 2015, when the United States Environmental Protection Agency (EPA) issued a notice of violation of the Clean Air Act to German automaker Volkswagen Group, that had an American attorney, specializing in mediation and alternative dispute resolution oversee their U.S. compensation of VW diesel owners affected?
Sentence (from "Volkswagen emissions scandal"): The programming caused the vehicles' NO output to meet US standards during regulatory testing but emit up to 40 times more NO in real-world driving.
Relevant evidence: No