What is diesel smoke?

Diesel smoke is the visible emissions produced when diesel fuel is burned in engines, characterized by a thick, dark appearance. It primarily consists of particulate matter, unburned hydrocarbons, nitrogen oxides, and other pollutants. The smoke can be a result of incomplete combustion, engine malfunctions, or the use of low-quality fuel. Diesel smoke is a concern for air quality and public health due to its harmful components.