Assessing the ambient air quality patterns associated to the COVID-19 outbreak in the Yangtze River Delta: A random forest approach.

2018–19 indicate that the air pollutant concentrations decreased significantly in Jiangsu Province, such as PM 10 , PM 2.5 , SO 2 , NO 2 and CO decreased by an average of −35.81%, −32.29%, −40.95%, −34.00% and −20.00% respectively, while O 3 was the only pollutant, which exhibited an increasing trend (7.67%) ( Table S1 , Fig. 6 and 7, S1-4 ).

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