Major air pollutants can be sub divided into 2 catexampleories: Inorganic gases and particular gases.
(A) Inorganic gases
1. Carbon monoxide (CO)
CO is a colourless, lethal gas and poisonous which is one of the most serious air pollutants.
Source: Some of the sources of CO are -
(i) Incomplete combustion of automobile engines, carbonaceous matter and also in defective furnaces.
(ii) Incomplete combustion of agricultural, fossil fuels and slash matter.
(iii) Reaction of carbon dioxide and carbon at high temperatures in industrial processes.
(iv) Dissociation of carbon dioxide at very high temperatures.