Diesel is considered as a carcinogen anyway due to the emission of nanoparticules. Good on them. See http://www.nytimes.com/2012/06/13/health/diesel-fumes-caus

Diesel is considered as a carcinogen anyway due to the emission of nanoparticules. Good on them. See http://www.nytimes.com/2012/06/13/health/diesel-fumes-cause-lung-cancer-who-says.html?_r=0 http://www.nytimes.com/2012/06/13/health/diesel-fumes-cause-... for example.