Q. 224.3( 15 Votes )
How is SO2 an air pollutant?
SO2 is a highly irritating gas and causes serious respiratory problems, and may cause a fit of coughing.
1. It reacts with water vapour present in the atmosphere to form sulphuric acid. This causes acid rain. Acid rain damages soil [soil become more acidic], plants, and buildings get corroded, especially those made of marble.
In the air, SO2 is oxidized to SO3 which is also an irritant.
2SO2 + O2 → 2SO3
SO3 + H2O → H2SO4
2. Even in very low concentrations, SO2 causes irritation in the respiratory tract. It causes throat and eye irritation and can also affect the larynx to cause breathlessness.
3. It is extremely harmful to plants. Plants exposed to sulphur dioxide for a prolong time lose colour from their leaves. This condition is known as chlorosis. This is because the formation of chlorophyll is retarded in presence of sulphur dioxide.
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Looking at the deteriorating air quality because of air pollution in many cities of the country, the citizens are very much worried and concerned about their health. The doctors have declared health emergency in the cities where the air quality is very severely poor.
(a) Mention any two major causes of air pollution.
(b) Write any two harmful effects of air pollution to plants and humans.
(c) As a captain of your school Eco-club, suggest any two programmes you would plan to organise in the school to bring awareness among the students on how to check air pollution in and around the school.Biology - Board Papers
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