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 foms harmful chemicals when mixed with
other pollutants in the air.
d carbon dioxide cannot be considered a pollutant under any circumstances.