Question

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

Answer 1

when petroleum is burned it undergoes partial combustion and leaves carbon monoxide a harmful substance but CNG does not polute the air

Answer 2

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The use of CNG (Compressed natural Gas) in automobiles has reduced pollution in our cities as combustion of CNG produces very small amounts of harmful products compared to diesel and petrol. Therefore, CNG is a cleaner fuel.