Question

Name the gas which acts as a pollutant only when present in excess

Answer 1

Carbon dioxide can be either described as pollutant or not a pollutant depending on the source of emission. The carbon dioxide gas which is released as the exhausts and emissions from the industries causes pollution when in excess and are referred as a pollutant. The carbon dioxide which is released from the plants and animals as the end product of respiration is not considered as a pollutant.