As a secondary pollutant of photochemical pollution,peroxyacetyl nitrate(PAN)has at-tracted a close attention.A four-month campaign was conducted at a rural site in North China Plain(NCP)including the measurement of PAN,O3,NOx,PM2.5,oxygenated volatile organic compounds(OVOCs),photolysis rate constants of NO2 and O3 and meteorological parameters to investigate the wintertime characterization of photochemistry from Novem-ber 2018 to February 2019.The results showed that the maximum and mean values of PAN were 4.38 and 0.93±0.67 ppbv during the campaign,respectively.The PAN under different PM2.5 concentrations from below 75 μg/m3 up to 250 μg/m3,showed different diurnal varia-tion and formation rate.In the PM2.5 concentration range of above 250 μg/m3,PAN had the largest daily mean value of 0.64 ppbv and the fastest production rate of 0.33 ppbv/hr.From the perspective of PAN's production mechanism,the light intensity and precursors con-centrations under different PM2.5 pollution levels indicated that there were sufficient light intensity and high volatile organic compounds(VOCs)and NOx precursors concentration even under severe pollution level to generate a large amount of PAN.Moreover,the bimodal staggering phenomenon of PAN and PM2.5 provided a basis that PAN might aggravate haze through secondary organic aerosols(SOA)formation.

Zhuoyu Li;Guangzhao Xie;Hui Chen;Bixin Zhan;Lin Wang;Yujing Mu;Abdelwahid Mellouki;Jianmin Chen

Department of Environmental Science&Engineering,Fudan Tyndall Center,Institute of Atmospheric Sciences,Fudan University,Shanghai 200438,China;Center for Excellence in Regional Atmospheric Environment,Institute of Urban Environment,Chinese Academy of Sciences,Xiamen 361021,China;Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;Institut de Combustion,Aérothermique,Réactivité et Environnement,Centre National de la Recherche Scientifique,45071 Orléans cedex 02,France

环境科学学报（英文版）

[1]Zhuoyu Li;Guangzhao Xie;Hui Chen;Bixin Zhan;Lin Wang;Yujing Mu;Abdelwahid Mellouki;Jianmin Chen-.Characterization of peroxyacetyl nitrate(PAN)under different PM2.5 concentration in wintertime at a North China rural site)[J].环境科学学报（英文版）,2022(04):221-232

peroxyacetyl,staggering

Characterization,nitrate,PAN,under,different,PM2,wintertime,North,China,rural,site,secondary,pollutant,photochemical,pollution,has,tracted,close,attention,four,month,campaign,was,conducted,Plain,NCP,including,measurement,O3,NOx,oxygenated,volatile,organic,compounds,OVOCs,photolysis,constants,NO2,meteorological,parameters,investigate,characterization,photochemistry,from,Novem,ber,February,results,showed,that,maximum,mean,values,were,ppbv,during,respectively,concentrations,below,up,diurnal,varia,formation,In,range,above,had,largest,daily,fastest,production,From,perspective,mechanism,light,intensity,precursors,levels,indicated,there,sufficient,high,even,severe,generate,amount,Moreover,bimodal,phenomenon,provided,basis,might,aggravate,haze,through,aerosols,SOA

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