Based on the ambient air monitoring data of Suzhou during the period of COVID-19 control in 2022 and the same period in 2021,the analysis shows that during the epidemic period,the average daily concentrations of O3 and SO2 increased compared with the previous year,the average daily concentrations of NO2,CO and PM10 decreased,and the daily variation concentration of PM2.5 was basically the same.The most important component of PM2.5 is water-soluble ions.The concentra-tions of NO3-,NH4 +,Mg2+,K+,and Na+ increased compared with the previous year.The concentration of SO42-,Ca2+,Cl-decreased.VOCs concentration generally increased,showing a change characteristic of first increasing and then decrea-sing,except for aromatic hydrocarbons,the proportion of OFP of other components increased.
维普
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