epa10968069 The Victoria Memorial as the city is engulfed in heavy smog, in Kolkata, India, 10 November 2023. Kolkata Region's Air Quality Index (AQI) slipped into the 'Severe and Hazardous' category, the Central Pollution Control Board (CPCB) reported. EPA/PIYAL ADHIKARY

epa10968067 The traffic moves along a street as the city is engulfed in heavy smog, in Kolkata, India, 10 November 2023. Kolkata Region's Air Quality Index (AQI) slipped into the 'Severe and Hazardous' category, the Central Pollution Control Board (CPCB) reported. EPA/PIYAL ADHIKARY

epa10968039 An Indian family ride a scooter as the city is engulfed in heavy smog, in Kolkata, India, 10 November 2023. Kolkata Region's Air Quality Index (AQI) slipped into the 'Severe and Hazardous' category, the Central Pollution Control Board (CPCB) reported. EPA/PIYAL ADHIKARY