Which of the Following Pollutants Has, by Far, Its Greatest

Question

Which of the following pollutants has, by far, its greatest source from fuel combustion?
A) NOx
B) SO2
C) VOCs
D) CO
E) Particulates

Accepted Answer

Sulfur dioxide (SO₂) is primarily produced from the combustion of fossil fuels, especially coal and oil, in power plants and industrial facilities.