Which air pollutant is a colorless gas with an irritating odor, and mostly comes from human sources such as smelting?
A) Nitric acid
B) Ozone
C) Nitrogen oxide
D) Sulfur dioxide
E) Carbon monoxide

Question

Quizplus · Accepted Answer

Sulfur dioxide (SO2) is a colorless gas with a sharp, irritating odor. It primarily comes from human activities such as the burning of fossil fuels at power plants and the smelting of metal ores.

Which Air Pollutant Is a Colorless Gas with an Irritating