It is critical because, unlike other issues, exhaust smoke is linked directly to the car's engine. The respiratory system is the closest thing in biology to which you can compare the exhaust.

A diagram of the exhaust ... they ran simulations with a car going at a high speed. Then came the helicopter. When connected to a helicopter's exhaust vents, the system produced 146 W of power.

Car exhaust smoke can come in various different colours and thicknesses, all of which can be an indication of your engine's overall health and what’s going on under the bonnet. Car exhaust smoke ...