Which of the following statements about air pollution is not true?
a. air pollution is caused by natural and human processes.
b. carbon monoxide and sulfur oxides are common air pollutants.
c. natural components of air, like carbon dioxide, cannot be considered air pollutants.
d. primary and secondary pollutants are harmful to human health and the environment.

c) Natural components of air, like carbon dioxide, cannot be considered air pollutants.

Explanation:

Carbon dioxide plays a role as greenhouse gas. Though living being emit carbon dioxide when they breathe, carbon dioxide is considered as a pollutant when associated with cars, power plants, and other human activities that involve the burning of fossil fuels such as gasoline and natural gas.

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a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.