India's Red FM Radio Jockey Rohan (L) take selfie after distributing free masks to motorists during an awareness campaign in New Delhi on October 31, 2018. - Smog levels spike during winter in Delhi, when air quality often eclipses the World Health Organization's safe levels. Cooler air traps pollutants -- such as from vehicles, building sites and farmers burning crops in regions outside the Indian capital -- close to the ground. (Photo by Prakash SINGH / AFP)