title: [Aerosol concentration variation in Nanjing during Asian Youth Games and the relationship between aerosol concentration and visibility].
abstract: To provide scientific support for improving air quality and for the policy-making during the Youth Olympic Games, the characteristics of aerosol concentration variation was analyzed with the data obtained during August in Nanjing, 2013. And further analysis was carried out to find the relationship between visibility and aerosol mass concentration as well as relative humidity (RH). The results show that the average mass concentration of PM10 and PM2.5 are 67.44 μg x m(-3) and 31.92 μg x m(-3), respectively. Integrated particle number and volume concentrations with diameter between 0.1 and 10 μm are 2 466.25 cm(-3) and 19.89 μm3 x cm(-3), respectively. A log-normal size distribution with 10-based logarithm applied to fit the measured aerosol size distributions shows two models with median diameters of 0.19 μm and 1.12 μm. Aerosol concentration in Nanjing is mainly affected by local source. The diurnal pattern of PM10 is influenced by the traffic density and the activity of boundary layer, while the daily variation of PM2.5 is slightly different because of the effects of traffic density and the formation of secondary pollutants during photochemical process. Statistical analysis on visibility reveals that visibility decreases with the increasing aerosol concentration and RH, PM2.5 concentration dominates the change of visibility when RH is less than 70%, while RH contributes more on the change for RH in excess of 70%.
authors: Liang
authors: L
authors: Yuan
authors: Yan
authors: Y
authors: Yin
authors: Qi
authors: Q
authors: Li
authors: Hui
authors: H
authors: Xiao
authors: Li
authors: L
authors: Li
mesh_terms: D000336:Aerosols / Q000032:analysis*; D000393:Air Pollutants / Q000032:analysis*; D002681:China; D004784:Environmental Monitoring; D008962:Models, Theoretical; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D052638:Particulate Matter