Submicron aerosol is of extensive concern not only due to its significant impact on air quality but also because it is detrimental to human health.In this study,we investigated the characteristics,sources and chemical processes of submicron aerosol based on real-time online measurements of submicron aerosols (NR-PM1) during December 2015 at an urban site in Beijing.The average mass concentration of NR-PM1 was 92.5±84.9 μg/m3,the hourly maximum was 459.1 μg/m3 during the entire observation.The organic aerosol (OA)(55％) was the largest contributor to NR-PM1.The average mass concentration of PAHs was 0.217±0.247 μg/m3,exhibiting the highest concentration at night and the lowest levels in the daytime.The average mass concentration of organic nitrate was 2.52±2.36 μg/m3 and that of inorganic nitrate was 7.62±8.22 μg/m3,accounting for 36％ and 64％,respectively,of the total nitrate mass.Positive matrix factorization (PMF) differentiated the OA into five chemical components including LV-OOA,SV-OOA,COA,HOA and CCOA,accounting for 22％,16％,13％,25％ and 24％ respectively,of the total OA.The average NR-PM1 mass concentra-tion on the heavy polluted days (HPD) was 182.8±70.2 μg/m3,which was approximately 9 times that on clean days (CD).The enhanced secondary formation of SNA was evident on HPD,especially the rapid increase of sulfate (23％) and nitrate (19％).

Peng Xu;Yuan Yang;Junke Zhang;Wenkang Gao;Zirui Liu;Bo Hu;Yuesi Wang

State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC),Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China;College of Resource and Environmental Engineering,Guizhou University,Guiyang 550025,Guizhou,China;University of the Chinese Academy of Sciences,Beijing 100049,China;Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China

环境科学学报（英文版）

[1]Peng Xu;Yuan Yang;Junke Zhang;Wenkang Gao;Zirui Liu;Bo Hu;Yuesi Wang-.Characterization and source identification of submicron aerosol during serious haze pollution periods in Beijing)[J].环境科学学报（英文版）,2022(02):25-37

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Characterization,identification,submicron,during,serious,haze,pollution,periods,Beijing,Submicron,extensive,concern,not,only,due,its,significant,impact,air,quality,also,because,detrimental,human,health,In,this,study,investigated,characteristics,sources,chemical,processes,real,online,measurements,aerosols,NR,PM1,December,urban,site,average,mass,concentration,was,hourly,maximum,entire,observation,largest,contributor,PAHs,exhibiting,highest,night,lowest,levels,daytime,nitrate,that,inorganic,accounting,respectively,total,Positive,matrix,factorization,PMF,differentiated,into,five,components,including,LV,OOA,SV,HOA,heavy,polluted,days,HPD,which,approximately,times,clean,CD,enhanced,secondary,formation,SNA,evident,especially,rapid,increase,sulfate

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