epaselect epa11689925 Indian people wear masks while walking as the city is engulfed in heavy smog at Rajpath, in New Delhi, India, 29 October 2024. According to the Central Pollution Control Board (CPCB), Delhi and the National Capital Region's Air Quality Index (AQI) slipped into the severe and very poor category. EPA/RAJAT GUPTA

epa11689934 An aerial view of city engulfed in heavy smog, in New Delhi, India, 29 October 2024. According to the Central Pollution Control Board (CPCB), Delhi and the National Capital Region's Air Quality Index (AQI) slipped into the severe and very poor category. EPA/RAJAT GUPTA

epa11689920 An aerial view of city engulfed in heavy smog, in New Delhi, India, 29 October 2024. According to the Central Pollution Control Board (CPCB), Delhi and the National Capital Region's Air Quality Index (AQI) slipped into the severe and very poor category. EPA/RAJAT GUPTA