A couple walks past crop stubble set on fire by farmers on the out skirts of Jalandhar, in the northern Indian state of Punjab, Wednesday, November 17, 2021. New Delhi, a city of 20 million, is one of the world’s most polluted cities. Air quality often hits hazardous levels during the winter, when the burning of crop residue in neighboring states coincides with lower temperatures that trap smoke. The smoke travels to New Delhi, obscuring the sky. (Photo by AP Photo/Stringer)
