Question

why is the use of disel and pitrol as fuels in automobiles being replaced by cng in big cities

Answer 1

due to increasing population this is a way
also it is much cheaper
petrol run on one litre only 25-30(in cars)
while on CNG it is 45-50 per kg.

Answer 2

The use of diesel and petrol as fuels in automobiles being replaced by cng (compressed natural gas) because of the following reasons:
(1) CNG is considered to be cleaner fuel.
(2) It doesn't cause much air pollution.
(3) That's why CNG is being used in place of diesel and petrol as fuels in automobiles in big cities to reduce pollution level.
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