The diesel engine of the car has a bad impression when it comes to perform the necessary emissions and cleanliness. If you notice black smoke produced from the exhaust system of the car, then it doesn’t mean that the diesel engine harms the environment. Generally, the diesel engine can spew a large amount of black smoke from the car. The following video helps you to determine the reasons behind the black smoke produced from the exhaust of diesel engines.
https://www.youtube.com/watch?v=9gsFEZ0Lwak