Kolkata's air quality improved by around 80-90 per cent after Cyclone Jawad-induced rain lashed the city in the last couple of days, pollution control board officials and environmentalists said on Tuesday.
The Air Quality Index (AQI) of 20 (good) was registered at Victoria Memorial, 43 (good) at Ballygunge, 33 (good) at Rabindra Sarobar, and 51 (satisfactory) at Rabindra Bharati University at 7 AM on Tuesday, as per data provided by the Central Pollution Control Board.
It was 185 (moderate) at Victoria Memorial, 212 (poor) at Ballygunge, 163 (moderate) at Rabindra Sarobar, and 307 (very poor) at Rabindra Bharati University at 9 AM on December 3 before the rain kicked in, it said.
"A maximum of 90 per cent and a minimum of 80 per cent improvement in the AQI of Kolkata was reported after the cyclone-induced rain lashed the city. This was a record low for the city in the month of December in the last 40 years," Environmentalist S M Ghosh told PTI.
West Bengal Pollution Control Board (WBPCB) Chairman Kalyan Rudra said that the improvement in AQI was very encouraging and air pollution was certainly one of the lowest, and the unseasonal rain definitely played a part in it.
He, however, said there was no mechanism to monitor real-time air quality four decades ago.
The average PM 2.5 level was at 19 mg per cubic meter, which is one of the lowest in the air pollution history of the eastern metropolis, the WBPCB said.
Even Howrah's Ghusuri, which normally records heavy air pollution due to the presence of several foundries where junk metals are processed, the AQI was 40 (good).
The AQI at Victoria Memorial monitoring station on December 6 last year was 254, and 175 in 2019.
TEMPO, a collaborative space mission by NASA, NOAA, and the Smithsonian Astrophysical Observatory, is transforming air quality tracking across North America. Since 2023, it has delivered hourly, high-resolution pollution data from space, aiding researchers, health officials, and the public.
The Delhi government has rolled back a contentious order denying fuel to 'end of life' cars - the term for petrol vehicles registered over 15 years ago and diesel vehicles more than 10 years.
India's demographic health survey 2019-21 reveals that 13 per cent of children were born prematurely, and 17 per cent with a low weight at birth, with air pollution contributing to the adverse birth outcomes.
The city recorded a minimum temperature of 25.2 degrees Celsius on Tuesday, with the weather office predicting light to moderate rain.
Cloud seeding is generally considered moderately effective, with studies and real-world programmes showing it can increase rainfall under the right conditions.
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