This video lecture from Environmental Chemistry (F.Sc. second year Chemistry) covers an introduction to primary and secondary air pollutants. The source and composition of various primary pollutants is discussed. Carbon-monoxide is discussed in detail along with its effect on the human beings. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.