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Air quality turned poor across Kolkata on a foggy day on Friday as particulate matters hung in the air, an official of the West Bengal Pollution Control Board (WBPCB) said.
In the northern parts of the city, air quality was categorised as very poor as wintry conditions prevailed preventing the dust particles from dispersing.
"The fog and smoke from vehicles, open-air burning of tree logs and waste during winter and smoke from coal all contributed to this poor and very poor air quality level in the city," environmentalist and green activist S.M Ghosh said. (PTI)