The single major source for photochemical reactants in the United States are
A) steel mills and the agricultural industry.
B) electrical generation stations.
C) automobiles.
D) rapid transit, buses, and excessive use of light rail systems.

Question

Quizplus · Accepted Answer

The exhaust gas from the internal combustion engines of automobiles is the single major source for photochemical reactants in the United States. These reactants are a primary cause of smog and ground-level ozone, which are harmful to human health and the environment. While steel mills, agricultural industries, electrical generation stations, rapid transit, buses, and light rail systems may contribute to air pollution, they are not the primary sources of photochemical reactants in the US.

The Single Major Source for Photochemical Reactants in the United