Mohammad Bond

Biology

17 March, 19:38

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.