The emissions cheating scandal at Volkswagen has initiated a reconsideration of how pollution tests are carried out worldwide. Credit Alexander Koerner/Getty Images In the United States, automakers conduct their own emissions tests and submit the results to the government. In Europe, automakers pick who conducts the tests and where they are done. And these two regulatory systems are considered the world’s gold standards. Questions about the wisdom of allowing automakers so much sway in how air pollution standards are enforced grew on Wednesday after the resignation of Volkswagen’s chief executive , following the company’s diesel emissions cheating scandal . Regulators in several European countries have opened investigations, attorneys general in the United States have joined federal inquiries, and there has been broader criticism of Volkswagen , and diesels, in markets from South Korea to Brazil. Volkswagen has admitted installing software in 11 […]