A) Ammonia
B) Methane
C) Carbon monoxide
D) Sulphur dioxide
Correct Answer: B
Solution :
Ozone is an isotope of oxygen. It exists at a height of about 15-60 km in the middle and upper stratosphere and lower Tiesosphere. Major pollutant responsible for the repletion of ozone are chlorofluorocarbons (CFCs), nitroyn oxides and hydrocarbons (like benzene, methane). Methane is a gaseous pollutant in minute quantity in air about .0002% by volume. Higher concentration may cause explosions. A high levels in absence of \[{{O}_{2}}\] methane may be narcotic on man. \[S{{O}_{2}}\] causes intense irritation to eye and respiratory tract. This gas causes damage to higher plants forming necrotic areas on leaf. There is a bleaching of leaf pigments due to conversion of chl. to phaepphytin-a. Carbon monoxide is very harmful to those persons exposed to conjusted highways to a level of about 100 ppm. CO causes difficulty in breathing, causes headache, and irritation of mucous membrane.
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