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Answer :
The use of CNG in automobiles has reduced pollution in our cities in the following ways:-
(a) CNG automobiles emits less carbon dioxide, carbon monoxide, sulphur dioxide and nitrogen dioxide which is beneficial for the environment as CNG plays a crucial role in preventing global warming and acid rain.
(b) CNG automobiles leave no residue after its combustion thus undergoing complete and clean combustion.
(c) CNG automobiles run quieter than gasoline and diesel automobiles which results in less noise pollution.