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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 or diesel reduce pollutions in following ways:
(i) It produces less carbon monoxide gas.
(ii) It produces less carbon dioxide gas.
(iii) It produces lass amount of sulphur dioxide and nitrogen dioxide which cause acid rain.
(iv) No residue remains after combustion.
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