VICTOR DE SCHWANBERG / SCIENCE PHOTO LIBRARY VICTOR DE SCHWANBERG / SCIENCE PHOTO LIBRARY
Car emissions test. Mechanic using a computer that tests a vehicle's exhaust emissions for various gases. It monitors the amount of carbon monoxide, carbon dioxide and nitrogen oxides, amongst others, in the exhaust. Carbon monoxide and nitrogen oxides are both toxic to humans, and all three are greenhouse gases, whose emission contributes to global warming.
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