A principal source of air pollution in the United States is
A) motor vehicles.
B) fertilizers, pesticides, and detergents.
C) the steel industry.
D) nuclear reactors.
E) discharges from municipal sewage plants.

Question

Quizplus · Accepted Answer

Motor vehicles are the largest contributor to air pollution in the US, emitting pollutants such as carbon monoxide, nitrogen oxides, and particulate matter. While other sources such as industry and agriculture also contribute, motor vehicles are the primary source.

A Principal Source of Air Pollution in the United States