In 2020, many major cities experienced substantial reductions in air pollution. Although lockdowns imposed due to outbreak of COVID-19 had an impact on emissions, weather also effects air pollution levels. There were observed PM2.5 reductions of 39 percent in Singapore in 2020, but without the influence of weather the reductions were slightly less at 25 percent. Weather also influenced PM2.5 levels in Jakarta that year, where observed reductions were 20 percent, and de-weathered reductions were 11 percent.
Observed and de-weathered PM2.5 reductions in select major cities worldwide in 2020 compared to 2019
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IQAir. (March 16, 2021). Observed and de-weathered PM2.5 reductions in select major cities worldwide in 2020 compared to 2019 [Graph]. In Statista. Retrieved June 28, 2022, from https://www.statista.com/statistics/1277867/pm25-reductions-in-major-cities-worldwide/
IQAir. "Observed and de-weathered PM2.5 reductions in select major cities worldwide in 2020 compared to 2019." Chart. March 16, 2021. Statista. Accessed June 28, 2022. https://www.statista.com/statistics/1277867/pm25-reductions-in-major-cities-worldwide/
IQAir. (2021). Observed and de-weathered PM2.5 reductions in select major cities worldwide in 2020 compared to 2019. Statista. Statista Inc.. Accessed: June 28, 2022. https://www.statista.com/statistics/1277867/pm25-reductions-in-major-cities-worldwide/
IQAir. "Observed and De-weathered Pm2.5 Reductions in Select Major Cities Worldwide in 2020 Compared to 2019." Statista, Statista Inc., 16 Mar 2021, https://www.statista.com/statistics/1277867/pm25-reductions-in-major-cities-worldwide/
IQAir, Observed and de-weathered PM2.5 reductions in select major cities worldwide in 2020 compared to 2019 Statista, https://www.statista.com/statistics/1277867/pm25-reductions-in-major-cities-worldwide/ (last visited June 28, 2022)