Assessment of Air Pollution Changes during COVID-۱۹ Pandemic in Jiangsu Province of China from ۲۰۱۸ to ۲۰۲۱

The COVID-۱۹ pandemic, which began during early ۲۰۲۰, had been a worldwide problem, resulting in significant fatalities. In China, the pandemic resulted in strict lockdowns, restricted movement, and reduced transportation. This resulted in improvement of air quality in many cities in China. The objective of the study is to compare the nature of air quality pre-COVID period (۲۰۱۸-۲۰۱۹) and during COVID period (۲۰۲۰-۲۲۰۱). The following air quality parameters were investigated, air quality index (AQI), particulate matter (PM۲.۵ and PM۱۰), sulphur dioxide (SO۲), nitrogen dioxide (NO۲), ozone (O۳), and carbon monoxide (CO). The present investigation results will augment to the current understanding on the air pollution situation during the COVID-۱۹ pandemic in Jiangsu Province in China. The study revealed that air quality in Jiangsu Province improved during the months when COVID-۱۹ positive cases increased. The reduction in air pollutants concentrations started during ۲۰۲۰ and reached a maximum during ۲۰۲۱. Overall the air quality index (AQI) improved by ۸.۲ % and air pollutant reductions achieved were, PMs (≈ ۲۱%), SO۲ (۲۶.۲ %), NO۲ (۱۳.۶ %), O۳ (۲.۴ %) and CO (۱۰.۴ %). Cities in Jiangsu Province with high air pollutant concentrations achieved a moderate reduction. The correlation between air pollutants and AQI was positive except for O۳. The implications of the study are, reduction of fossil fuel powered vehicles and industrial activity can make notable positive impact on the air quality of the region.

کلیدواژه ها:

Criteria air pollutants ، Lockdown ، Pandemic ، Particulate Matter ، Spearman’s correlation