This video lecture from Environmental Chemistry (F.Sc. second year Chemistry) covers acid rain and smog which are the aftermaths of polluted air. Primary pollutanmts like carbondioxide, sulfur dioxide and nitrogen oxides produce carbonic, sulfuric and nitric acids respectively in the atmosphere which effects the marine life, building material and human health badly. Smog is produced when fog and smoke reacts in the air producing chemically oxidizing or reducing smog which causes serious health related problems. 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.