SootTurkey
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152. Soot
Soot is a dark, carbon-rich form of particulate matter produced by incomplete combustion. In road vehicles, it is mainly associated with exhaust from diesel engines and consists of very small particles that can contribute to air pollution.
Modern diesel vehicles use particulate filters to trap much of this material before it leaves the exhaust. Excessive soot emissions can indicate problems with combustion, the engine or the emissions-control system.
Wikimedia.org • Ilya Plekhanov • CC BY-SA
What causes soot in vehicle exhaust?
Soot is produced when fuel does not burn completely. Diesel engines can produce particularly significant amounts of particulate matter, especially when combustion or emissions-control systems are not functioning correctly.
What does a diesel particulate filter do with soot?
A diesel particulate filter traps a large proportion of the soot particles in the exhaust. The filter periodically removes accumulated material through a process known as regeneration.
Can excessive soot indicate a vehicle problem?
Yes. Unusually high soot emissions can result from engine faults, poor combustion, a defective particulate filter or other problems with the emissions-control system.

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