View of Altamount road in the backdrop of the city skyline engulfed in heavy smog, in Mumbai.

A young man sits at Dadar beach in the backdrop of city skyline engulfed in smog, in Mumbai.

City skyline engulfed in heavy smog during a cold morning, in Ajmer.

Low visibility due to smog in Ajmer.

Gyarah Murtis engulfed in smog post 'Diwali' celebrations,at Sardar Patel Marg in New Delhi. Delhi''s air quality turned 'severe' on Diwali with stubble burning accounting for 32 p...

Vendors carrying plastic balls and toys walk through smog, post 'Diwali' celebrations, in New Delhi. Delhi''s air quality turned 'severe' on Diwali with stubble burning accounting ...

Metro train runs on its track amid low visibility due to smog, post 'Diwali' celebrations, in New Delhi. Delhi''s air quality turned 'severe' on Diwali with stubble burning account...

Vehicles ply amid low visibility due to smog, post 'Diwali' celebrations, in New Delhi. Delhi''s air quality turned 'severe' on Diwali with stubble burning accounting for 32 percen...

Parliament building engulfed in smog post 'Diwali' celebrations, in New Delhi. Delhi''s air quality turned 'severe' on Diwali with stubble burning accounting for 32 percent of the ...

Children play football at Rajpath amid low visibility due to smog, post 'Diwali' celebrations, in New Delhi. Delhi''s air quality turned 'severe' on Diwali with stubble burning acc...

A cyclist rides through smog post 'Diwali' celebrations, in New Delhi. Delhi''s air quality turned 'severe' on Diwali with stubble burning accounting for 32 percent of the city''s ...

Vehicles ply amid low visibility due to smog following 'Diwali' celebrations, in New Delhi.

A layer of smog envelops the skyline as residential buildings are decorated with colorful lights during Diwali, the Hindu festival of lights, on the outskirts of New Delhi, India

Vehicles ply amid low visibility due to smog during Diwali celebrations, in New Delhi.

Vehicles ply amid low visibility due to smog during Diwali celebrations, in New Delhi.

A view of the city skyline engulfed in smog, in Mumbai.

Vehicles ply on a road amid low visibility due to smog, on the outskirts of Amritsar.

Low visibility due to smog in New Delhi. This is the sixth “severe” air day on the trot in Delhi with air quality inching closer to “emergency” levels on Tuesday.

Vehicles ply amid low visibility due to smog, in New Delhi. This is the sixth “severe” air day on the trot in Delhi with air quality inching closer to “emergency” levels on...

North and South Block shrouded in smog, in New Delhi. The national capital's air quality remained “severe” for the fifth consecutive day on Monday, with calm wind speed exacerb...