Lockdowns in 2021 Not as Effective as Those in 2020 in Cleaning Delhi-NCR Air: CSE
The green think-tank also said the lockdown summers in 2020 and 2021 have been 25 to 40 per cent cleaner as compared to the summer of 2019. Coronavirus-induced lockdowns have helped improve the air quality in Delhi-NCR this year as well but not as effectively as last year since the 2021 curbs were shorter and less stringent, the Centre for Science and Environment (CSE) has found in a study. Meteorology would be partly responsible for this trend, but it could also be a reflection of weakening of pollution control-measures and efforts in the city and region, it said. Traffic intensity was also comparatively higher in 2021, it added. This year, restrictions in Delhi started on April 6 in the form of night-curfews and weekend lockdowns with complete lockdowns being imposed on April 19. The imposition of partial-lockdown lowered PM2.5 pollutant levels by 20 per cent; while the complete lockdown brought the average down by further 12 per cent, according to the CSE analysis. ”In 2020, partial lockdown started on March 12 with hard lockdown kicking in on March 25, which was lifted in phase-wise manner from May 18. Then the partial lockdown also brought PM2.5 levels down by 20 per cent, but the hard lockdown reduced it by another 35 per cent,” the CSE said. Lifting of restrictions from May 18 had led to 28 per cent rise in PM2.5 levels, it said.
