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Which of the following best explains why the use of CNG in Delhi public transport is considered a sustainable strategy and not merely a cost-saving measure?
ACNG lowers urban air pollution by reducing emissions from public transport at ground level, where exposure to the general population is highest
BCNG-powered vehicles can be retrofitted into existing diesel engines without modification
CCNG supply is subsidised under the LPG scheme for rural households
DCNG is cheaper than petrol over the lifetime of the vehicle and lowers maintenance
Answer & Solution
Correct answer: A. CNG lowers urban air pollution by reducing emissions from public transport at ground level, where exposure to the general population is highest
Vehicular emissions are ground-level sources with maximum exposure on the population; switching to CNG significantly lowers urban pollutants. Cost and retrofitting are operational considerations and do not by themselves make the switch a sustainability strategy.
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