Journal of Shanghai University(Natural Science Edition) ›› 2020, Vol. 26 ›› Issue (2): 263-274.doi: 10.12066/j.issn.1007-2861.2025

• Research Articles • Previous Articles     Next Articles

Based on the variation of black carbon in PM2.5 to observe pollution episode in winter Shanghai

CHEN Qi1, FANG Yin2, FENG Yanli1(), ZHANG Fan2, ZHU Wenjie1, WANG Wu1, CHEN Yingjun2   

  1. 1. Institute of Environmental Pollution and Health, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China
    2. College of Environmental Science and Engineering, Tong Ji University, Shanghai 200092, China
  • Received:2018-04-10 Online:2020-04-30 Published:2020-04-29
  • Contact: FENG Yanli E-mail:fengyanli@shu.edu.cn

Abstract:

During the period between November 29th and December 9th in 2016,two air pollution episodes occurred in Shanghai, with the highesthourly concentration of PM2.5 reaching 119 and 179 ug/m3, respectively. The concentration of black carbon (BC) wasobserved, and fine particle matter was sampled and compositions suchas organic carbon (OC), element carbon (EC), water-soluble ions andelement were analyzed in two pollution episodes to observe thecomposition and source of PM2.5. Investigation results showedthat in two pollution episodes, the average concentrations of PM2.5 in pollution stage were 4.2 and 3.9 times of that inclean stage, respectively. The average concentrations of BC inpollution stage were 1.6 and 1.9 times of that in clean stage. Thehighest BC hourly concentration and the proportion of BC in PM2.5 during pollution episodes were 8.94 ug/m3 and22.0%. The average proportions of BC in PM2.5 in clean stagewere 11.8% and 7.5%, respectively, which were higher than theproportion in pollution stage (4.4% and 3.7%). The averageproportions of secondary pollutants in PM2.5 were 41.8% and31.9%, respectively. The average proportions of secondary organiccarbon (SOC) in OC were 42.5% and 34.9%, respectively. Coalcombustion, vehicles, boats and biomass burning contributedsignificantly to the pollution episodes.

Key words: PM2.5, black carbon (BC), pollution episodes, secondary pollutants

CLC Number: