Till Nov this year, Kolkata's air quality better than that that of 2019: PCB report
Kolkata: A report published by West Bengal Pollution Control Board (WBPCB) recently has made clear how lockdown and some measures taken by the board have done miracle with the air quality of the city. Though the air quality in the month of December raised concerns among environmentalists, it was found to be better till November compared to 2019. The report said that there were 148 good days in 2020 compared to 85 in 2019 in the city. Poor days were reduced to 40 in 2020 from 45 in 2019. In Kolkata, very poor days were reduced from 29 in 2019 to two in 2020. In Howrah, very poor days were reduced from 36 to seven. “Apart from lockdown, some of our measures based on scientific studies, including the source-apportionment study, have started yielding results. Spraying of water to stop road dust resuspension, shifting to cleaner fuel by roadside eateries, action against waste burning have started giving results. But the meteorological factors play a huge role. Cloud cover, low wind velocity and fog in winter can suddenly turn ambient air very foul. However, we need more studies in some unknown areas to understand the transborder flow of pollutants to fight it more effectively,” said WBPCB chairman Kalyan Rudra. The 2019, trend showed that Kolkata and Howrah had faced bigger challenge with more days in very poor category and above. About 10% of days in 2019 (till November) in these two cities were in very poor category. In Kolkata, this includes five severe days as well — the worst category. The transitory improvement in air quality in these cities this year so far is a result of the halting of the economy as well as activities during the summer lockdown. “But this should be taken as an opportunity to push implementation of the clean air action plans to prevent rebound effects and retaliatory emissions that are expected to increase with the reopening of the economy,” said air pollution expert and executive director of Centre for Science and Environment (CSE), Anumita Roychowdhury. In Kolkata, around 45% of days in 2019 (until November) had exceeded the daily standard, whereas in 2020, it is around 35% — both in Kolkata and Howrah, said Roychowdhury.
