𝗞𝗼𝗹𝗸𝗮𝘁𝗮 𝗿𝗮𝗻𝗸𝘀 𝘀𝗲𝗰𝗼𝗻𝗱 𝗯𝗲𝘀𝘁 𝗮𝗺𝗼𝗻𝗴 𝗺𝗲𝘁𝗿𝗼𝗽𝗼𝗹𝗶𝘁𝗮𝗻 𝗰𝗶𝘁𝗶𝗲𝘀 𝗮𝗰𝗿𝗼𝘀𝘀 𝘁𝗵𝗲 𝘄𝗼𝗿𝗹𝗱 𝗶𝗻 𝗔𝗤𝗜 𝗹𝗶𝘀𝘁. IIT-Delhi's Centre of Excellence for Research in Climate Change and Air Pollution (CERCA) found Kolkata to be the second cleanest city after Chennai among the 11 metropolitan cities in the world in May 2024, as far as PM2.5 concentration in the air is concerned. The other cities included were Mumbai, Bengaluru, Delhi, Beijing, New York, London, Seoul, Tokyo, and Dhaka. Among the global cities, Dhaka, 406 km away from Kolkata in Eastern Bengal, emerged as the worst polluted city, with a PM2.5 concentration close to 140 µg/m³ (microgram per cubic metre), while Kolkata and Chennai emerged cleaner with PM2.5 concentration below 20 µg/m³. Dhaka was closely followed by Delhi, with PM2.5 hovering above 80 µg/m³.
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