c.e.o. mafias miller described the practice as an ethical and repulsive and promised to investigate reports that german carmakers finance tests in which monkeys as well as humans are exposed to toxic diesel fumes in an effort to defend the diesel against revelations that it is pollutants cause cancer now the revelations about these questionable tests come at a time and europe's car industry is effectively fighting for its life these legends lead the market in most e.u. countries but facing increasing pollution the european union is now taking a tough stance on diesel cars there's no dispute that nitrogen oxide pollution is a problem levels are too high in places like dusseldorf stuttgart munich and hamburg as well as berlin a total of twenty eight german cities exceed limits in some cases dramatically it's not just term germany though france has nineteen affected areas including paris and its suburbs britain has sixteen including london in total twenty three of the twenty eight you countries exceed air quality norms of germany's and byron mental agency says two thirds of nitrogen oxides are