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    Rights: Alexander Ishchenko, licenced through 123RF Ltd Published 18 June 2008 Size: 130 KB Referencing Hub media

    Car exhaust can contain particulates, especially if the vehicle is an older car or runs on diesel. Scientists are concerned that the particulates carry toxic chemicals, such as nitrous oxide and carbon monoxide, deep into our lungs where they can make us ill.

    The US EPA reports that a typical passenger vehicle emits about 4.6 metric tons of carbon dioxide per year. CO2 is a greenhouse gas.