Air pollution is
A) a form of photochemical smog.
B) gaseous sulfur and phosphorus.
C) a concentration of a trace substance at a level greater than occurs in average air.
D) a concentration of a trace substance at a level greater than one percent.
E) concentrated in tropical regions.

Question

Quizplus · Accepted Answer

Air pollution is defined as a concentration of a trace substance at a level greater than occurs in average air. This can include a variety of pollutants such as ozone, particulate matter, and volatile organic compounds.

Note: A is incorrect because photochemical smog is a type of air pollution, not the definition of air pollution itself. B and D are incorrect because they do not accurately describe air pollution. E is incorrect because air pollution is not limited to tropical regions - it can occur anywhere with high levels of industrial or vehicular activity.

Air Pollution Is