<P> Exhaust gas or flue gas is emitted as a result of the combustion of fuels such as natural gas, gasoline, petrol, biodiesel blends, diesel fuel, fuel oil, or coal . According to the type of engine, it is discharged into the atmosphere through an exhaust pipe, flue gas stack, or propelling nozzle . It often disperses downwind in a pattern called an exhaust plume . </P> <P> It is a major component of motor vehicle emissions (and from stationary internal combustion engines), which can also include: </P>

The exhaust fumes from automobiles are an example of
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