Question

why is the use of diesel and petrol as fuels in automobiles being replaced by Compressed Natural Gas (CNG) in big cities

Answer 1

Because CNG doesn't create much amount of pollution then petrol and diesel

Answer 2

diesel and petrol as fuels in automobiles are being replaced by compressed natural gas (cng) in bid cities so as to decrease the quality and quantity of pollution made by these fuels .
compressed natural gas (cng) is the right substitute as it is environment friendly and does not produce pollution .

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