21 ) Which one of the following is an air pollutant?
A) Oxygen
B ) Nitrogen
Ο Ο Ο Ο
C) Carbon dioxide
D) Carbon monoxide
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C.) CARBON DIOXIDE
Carbon dioxide is a chemical compound composed of one carbon and two oxygen atoms. It is often referred to by its formula CO2. It is present in the Earth's atmosphere at a low concentration and acts as a greenhouse gas. In its solid state, it is called dry ice.
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