The most important source of air pollutants is
A) oil refining.
B) manufacturers of paper products.
C) the electrical power companies.
D) motor vehicles.

Question

Quizplus · Accepted Answer

Motor vehicles are the largest source of air pollutants, with the burning of fossil fuels in engines contributing to the release of harmful pollutants. Oil refineries and electrical power companies are also significant sources, but motor vehicle emissions have a greater impact on local air quality. Manufacturers of paper products are not a major source of air pollutants.

The Most Important Source of Air Pollutants Is