Sri Lankan players wear anti-pollution masks on the field as the air quality deteriorates during the second day of their third test cricket match against India in New Delhi.

School children hold banners take out march to express their distress on the alarming levels of pollution in the city, in New Delhi.

A woman shops for air purifiers at a market place in New Delhi.

A rickshawpuller ferries a balloon vendor through dense smog in Meerut.

A school boy walks across a pedestrian bridge as the morning sun is enveloped by a blanket of smog in New Delhi.

A NDMC worker sprays water on a tree to settle dust as part of the measure against pollution, in New Delhi.

Nikunj Pandey, left, sits with his friends wearing pollution mask in New Delhi. Experts have compared it to smoking a couple of packs of cigarettes a day. A recent report by the La...

The morning sun is enveloped by a blanket of smog on the outskirts of New Delhi. A thick gray haze has enveloped capital region as air pollution hit hazardous levels.

Commuters wait for transport amid thick blanket of smog on the outskirts of New Delhi.

People emerge from a thick blanket of smog on the outskirts of New Delhi. As air pollution peaked this week in Delhi, it rose to more than 30 times the World Health Organization’...