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.
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Which of the following statements about air pollution is not true?
a. air pollution is caused...
a. air pollution is caused...
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