China's effective measures in fighting against COVID-19 and pollutant changes in Wuhan during corresponding periods

The δ- and λ-variants of COVID-19 are blowing to globle economy, human life and health. The variants put the world in a harsher state. Lockdown is powerful in stopping the spread and infection. We evaluate the lockdown impact on NO2, SO2, O3, PM2.5 and PM10 in Wuhan, which reported the first COVID-19 case. Data before, during and after blokade in year 2020 were all analyzed. Lockdown significantly decreased four of the five pollutants. The decreasing reasons are discussed in social policies, people's living habits and Chinese characters. Wuhan is a transportation hub in central China. Viruses spread through it to all over the country. Although COVID-19 mainly bring bad social effects, people get chance to rethink the value of life: We should sustainablely develop and pursuing spiritual instead of excessive material enjoyment. These ultimately built more stable societies and benefit mankind itself.