in david suzuki's site
it says, motor vehicles are a major source of poputlation including carbon monoxide, oxides of nitrogen, ozone, volatile organic compounds and small airborne particulates. these pollutions add to a big range of health issues including impaired lung function, shortness of breath, wheezing, asthma attacks and premature death.
read more about this topic at http://www.davidsuzuki.org/_pvw370829/_email_archive/email03270301.asp
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