While there was a complete lockdown in 2020, the 2021 lockdown saw a high movement of people seeking healthcare facilities due to increased COVID-19 cases and the state elections in West Bengal. Similarly, Kolkata's PM 2.5 concentration swayed from 41.8 ug/m3 in 2019 to 27.9 ug/m3 in 2020 and 37.3 ug/m3 in 2021. On the other hand, Delhi's average PM 2.5 concentration for the three months dipped from 95.6 ug/m3 in 2019 to 69 ug/m3 in 2020 but was quickly back to 95 ug/m3 in 2021.
Dhaka of Rajdhani College, Delhi University. While cyclones such as Tauktae act as a washout or cleaning effect on the atmosphere slow wind conditions, favourable conditions of long transport of particulate matters from neighbouring states act as accumulation, suggesting a marginal increase of the pollutants," said S.K. "Mumbai being a coastal city has a mixed effect of local meteorology and prevalent conditions of large-scale motions, including that of cyclones. The safe limit for PM 2.5 (particulate matter measuring less than 2.5 microns) as prescribed by the CPCB is 40 ug/m3. Mumbai's average concentration of PM 2.5 between March and May in 2019 was 21.6 micrograms per cubic meter of air, or ug/m3, which increased to 31.3 ug/m3 in 2020 and then to 40.3 ug/m3.
The study revealed that except Mumbai, all cities showed a dip in the average PM 2.5 levels during the three months in 2020. Researchers compared the Central Pollution Control Board (CPCB) air quality data for Delhi, Lucknow, Mumbai and Kolkata over the three months from March 2019-when there was no lockdown-and 20-when there was complete lockdown in these cities. Also part of the study was Kolkata, the only city to show improvement in the air quality in these months from 2019 to 2021. However, Mumbai's PM 2.5 concentration only increased year on year from March to May from 2019 to 2021.
The analysis is done by the New Delhi-based climate communications initiative, Climate Trends. India rejoiced in the silver lining of clear skies during the COVID-19 resultant lockdown in 20 but an analysis showed pollution levels remained above permissible limits in Delhi and Lucknow.
0 kommentar(er)
