Exhaust gas is gas which occurs as a result of combustion of fuel such as gasoline/petrol, diesel or coal. It is discharged to atmosphere through an exhaust pipe or chimney.
Although much of it is harmless carbon dioxide, part of it is noxious or toxic substances, such as carbon monoxide (CO), hydrocarbons, nitrogen oxides (NOx), and particulate substances. Diesel exhaust has a characteristic smell.
Emission standards often focus on reducing pollutants contained in exhaust gas.
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