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Explain how the use of CNG in automobile...

Explain how the use of CNG in automobiles has reduced pollution in our cities.

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The use of CNG in place of petrol and diesel reduce pollutions in following ways:
(i) It produces less carbon monoxide gas.
(ii) It produces less carbon dioxide gas.
(iii) It produces less amount of sulphur dioxide and nitrogen dioxide which cause acid rain.
(iv) No residue remain after combustion.
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Any further increase in the pollution level in the city by way of industrial effluents and automobile exhaustions would pose a severe threat to the inhabitants. ( A) All the factories in the city should immediately be closed down. (B) The automobiles should not be allowed to ply on the road for more than four hours a day. (C) The government should restrict the issue of fresh licences to factories and automobiles. (D) Cancer, heart attacks, brain strokes, tuberculosis are the major disease which are rapidly increasing in industrial cities. (E) All types of pollutants are very harmful for health. (F) Excessive growth of industries has increased the pollution level in the city. Which of the following (A), (B), (D) and (F) may be the effect of increment in the pollution level in the city?

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