Exhaust gas that they produce smaller quantities of toxic pollutants (e.g. oxides of nitrogen) than petrol and diesel engines of the same power. They produce larger quantities of carbon dioxide but less carbon monoxide due to more efficient combustion. Researchers from the University of California, Los Angeles School of Public Health say preliminary results of their statistical study of children listed in the California Cancer Registry born between 1998 and 2007 found that traffic pollution may be associated with a 5% to 15% increase in the likelihood of some cancers. A World Health Organization study found that diesel fumes cause an increase
What Car? car if they drive it gently and stick to speed limits, but don't resort to any unrealistically slow acceleration or special hypermiling techniques. These True MPG figures are published alongside the official government fuel economy data, that car manufacturers are legally obliged to include in brochures. In June 2012, "What Car?" launched an online car buying service called 'What Car Approved Used', which it claimed provides "peace of mind" to car buyers, by endorsing the "10 Points of Difference" promoted by the "National Franchised Dealers Association". The agreement came to a close in July 2015, and "What Car?" began to