Passenger cars cause less pollution than motorcycles, according to the results of a recent study. The Swiss Federal Laboratories for Materials Testing and Research's Martin Weilenmann and Ana-Marija Vasic conducted the study which revealed that the hydrocarbons emission of motorcycles 16 times higher than that of cars, and in the case of carbon monoxide, it was found to be three times more. The other air pollutants emitted by motorcycles were also disproportionately high.
The study to be published in the January issue of the American Chemical Society's journal Environmental Science & Technology said that both two-and four-cycle motorcycle engines emitted significantly more of these pollutants than automobile engines.
The German, Japanese and Italian makes, though may be a feast to the eye for any speed enthusiast, emit hydrocarbons that have been linked to global warming and are even suspected of being carcinogenic, the study said.
Researchers said that since motorcycles weren't a primary means of transport in most developed countries, "the importance of [motorcycle] emissions has been underestimated in legislation, giving manufacturers little motivation to improve after treatment systems".