
The national capital's air quality is in "severe" category right now and Bangladesh batsman Liton Das was briefly seen wearing a face mask during his team's first training session at the Feroz Shah Kotla in New Delhi. (Express Photo by Vishal Menon)

Delhi's air quality, at this time of the year, remains either poor or severe owing to Diwali and stubble burning in the neighbouring states of Punjab and Haryana. (Express Photo by Praveen Khanna)

Delhi's air quality remained 'severe' on Thursday. (Express Photo by Praveen Khanna)

A smoky haze lingered over the national capital for the fifth consecutive day. (Express Photo by Praveen Khanna)

At 8 am on Thursday, the overall air quality index stood at 408. (Express Photo by Praveen Khanna)