The use of which of the following fuels can help in the reduction of air pollution?

CNG, compressed natural gas, burns cleanly with low emissions, making it the fuel that helps reduce air pollution.

Petrol combustion releases carbon monoxide, hydrocarbons and nitrogen oxides that worsen air quality.

Diesel emits high particulate matter and nitrogen oxides, adding to pollution.

Coal burning produces heavy sulphur dioxide, soot and carbon dioxide.

CNG contains mostly methane and yields far less particulate and sulphur output.

Many city bus and taxi fleets switched to CNG to clean urban air.