Lockdown effects of the COVID-19 on the spatio-temporal distribution of air pollution in Beijing, China.

The results indicate that except O 3 , the annual average concentration of NO 2 , PM 2.5 and SO 2 showed a decreasing trend during 2016 and 2019; NO 2 , PM 2.5 and SO 2 show a trend of “low in summer and high in winter”; the diurnal variation of NO 2 concentration was mainly related to the rush hours of traffic volume, with the first peak at the morning peak (7:00), and then accumulating gradually to second peak (22:00).

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