Which of the following is the largest source of air pollution these days?

For the control of air pollution in Delhi, all buses of Delhi were converted to run on $A$ by the end of $B$ as per the directives of the $C$. Complete the given statement by choosing appropriate options for $A-C$.

What efforts were made to reduce air pollution caused by vehicles in Delhi? Has the air quality in Delhi improved?

According to the Central Pollution Control Board $(CPCB)$,which particulate size in diameter (in micrometers) of air pollutants is responsible for the greatest harm to human health?

Oxides of sulphur and nitrogen are important pollutants of

Which of the following is considered the most harmful air pollutant among the given options?