Answer:
Air gets polluted by many reasons. Few of them are as follows : (i) Vehicles produce high level of pollutants like carbon monoxide, carbon dioxide, nitrogen oxide, smoke etc. These are very poisonous gases. Burning of fuel from vehicles also produces pollution. (ii) Many industries are also responsible for causing air pollution. Petroleum refineries release polluted gases such as sulphur dioxide, nitrogen dioxide etc. They cause espiratory problems, including lung damage. (iii) Other kinds of pollutants are CFCs which are largely used in refrigerators, air conditioners and aerosol sprays, deplete the ozone layer. It protects us from ultraviolet rays of the Sun. (iv) Some human activities like forest fire, burning of fire wood, cow dung cakes, burning of chaff etc. Cause air pollution. (v) Some natural phenomenon like fast dust storms, volcanic eruption produce smoke and dust particles.
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