Diesel, once thought to be clean, has been proven to be one of most toxic compounds known (New Science, Oct. 25, 1997). “Diesel smoke is around 40 times as carcinogenic as cigarette smoke” and “Research has indicated that life expectancy in large cities is reduced by around 15% by the inhalation of particulates . . .” Paper by Gong and Waring, “SAE Australia” May/June 1998.