Participants run past the India Gate as they take part in the Airtel Delhi Half Marathon in New Delhi, India, October 20, 2019. Show moreShow less
A runner wearing a face mask for protection from air pollution takes part in the Airtel Delhi Half Marathon in New Delhi, India, October 20, 2019. Show moreShow less
A runner wearing a face mask for protection from air pollution takes part in the Airtel Delhi Half Marathon in New Delhi, India, October 20, 2019. Show moreShow less
A man wearing a mask runs past the India Gate on a smoggy morning in New Delhi, India, October 28, 2019.Show moreShow less
A man paddles a home-made boat across Yamuna river on a smoggy morning in New Delhi, October 28, 2019. Show moreShow less
A woman wearing a mask walks inside a park on a smoggy morning in New Delhi, India, October 27, 2019. Show moreShow less
A man paddles a home-made boat across Yamuna river on a smoggy morning in New Delhi, October 28, 2019.Show moreShow less
Buildings are seen shrouded in smog in New Delhi, India, October 30, 2019. Show moreShow less
Buildings are seen shrouded in smog in New Delhi, India, October 30, 2019. Show moreShow less
A man rides a bicycle on a smoggy morning near India Gate in New Delhi, India, October 17, 2019. Show moreShow less
A runner wearing a face mask for protection from air pollution takes part in the Airtel Delhi Half Marathon in New Delhi, India, October 20, 2019. Show moreShow less
A man wearing a mask rides a cycle on a smoggy morning in New Delhi, India, October 28, 2019.Show moreShow less
Birds fly next to electricity pylons on a smoggy afternoon in the old quarters of Delhi, India, October 30, 2019. Image for illustrative purposes.Show moreShow less
Women walk in front of India's Presidential Palace on a smoggy morning in New Delhi, India, October 27, 2019. Show moreShow less
Vehicles drive through smog in New Delhi, India, October 30, 2019. Show moreShow less
A man paddles a home-made boat across Yamuna river on a smoggy afternoon in the old quarters of Delhi, India, October 30, 2019. Show moreShow less
A man rides a cycle past the India Gate on a smoggy morning in New Delhi, India, October 28, 2019.Show moreShow less