๐๐ผ๐น๐ธ๐ฎ๐๐ฎ ๐ฟ๐ฎ๐ป๐ธ๐ ๐๐ฒ๐ฐ๐ผ๐ป๐ฑ ๐ฏ๐ฒ๐๐ ๐ฎ๐บ๐ผ๐ป๐ด ๐บ๐ฒ๐๐ฟ๐ผ๐ฝ๐ผ๐น๐ถ๐๐ฎ๐ป ๐ฐ๐ถ๐๐ถ๐ฒ๐ ๐ฎ๐ฐ๐ฟ๐ผ๐๐ ๐๐ต๐ฒ ๐๐ผ๐ฟ๐น๐ฑ ๐ถ๐ป ๐๐ค๐ ๐น๐ถ๐๐. 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 ยตg/mยณ (microgram per cubic metre), while Kolkata and Chennai emerged cleaner with PM2.5 concentration below 20 ยตg/mยณ. Dhaka was closely followed by Delhi, with PM2.5 hovering above 80 ยตg/mยณ.
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