How can carbon dioxide be considered a pollutant when it is a natural component of air?
a. Carbon dioxide is considered a pollutant even though it is a natural component
of air, because it is harmful to all living organisms.
b. Carbon dioxide is considered a pollutant when larger concentrations than normal
are present in the air as a result of human activity.
c. Carbon dioxide is considered a pollutant, because it forms harmful chemicals
when mixed with other pollutants in the air.
d. Carbon dioxide cannot be considered a pollutant under any circumstances.
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