Real-time measurements of PM_(2.5),PM_(10-2.5),and BC in an urban street canyon  

作　　者：Yan Cheng Shun Cheng Lee Yuan Gao Long Cui Wenjing Deng Junji Cao Zhenxing Shen Jian Sun 

机构地区：[1]Department of Environmental Science and Technology,School of Human Settlements and Civil Engineering,Xi'an Jiaotong University [2]SKLLQG,Institute of Earth and Environment,CAS [3]Department of Civil and Environmental Engineering,Research Center for Environmental Technology and Management,The Hong Kong Polytechnic University [4]Department of Science and Environmental Studies and Centre for Education for Environmental Sustainability,The Hong Kong Institute of Education

出　　处：《Particuology》2015年第3期134-140,共7页颗粒学报（英文版）

基　　金：supported by the Hong Kong Polytechnic University(G-YX3L);National Science Foundation of China(NSFC21107084);State Key Laboratory of Loess & Quaternary Geology(SKLLQG0804)

摘　　要：A continuous dichotomous beta gauge monitor was used to characterize the hourly content of PM2.5, PM10-2.5, and Black Carbon （BC） over a 12-month period in an urban street canyon of Hong Kong. Hourly vehicle counts for nine vehicle classes and meteorological data were also recorded. The average weekly cycles of PM2.5, PM10-2.5, and BC suggested that all species are related to traffic, with high concentrations on workdays and low concentrations over the weekends. PM2.s exhibited two comparable concentrations at 10：00-11：00 （63.4 μg/m3） and 17：00-18：00 （65.0 p.g/m3 ） local time （LT） during workdays, correspond- ing to the hours when the numbers of diesel-fueled and gasoline-fueled vehicles were at their maximum levels： 3179 and 2907 h-1, respectively. BC is emitted mainly by diesel-fueled vehicles and this showed the highest concentration （31.2μg/m3） during the midday period （10：00-11：00 LT） on workdays. A poor correlation was found between PM2.s concentration and wind speed （R= 0.51, P-value 〉 0.001 ）. In contrast, the concentration of PM10-2.s was found to depend upon wind speed and it increased with obvious statistical significance as wind speed increased （R = 0,98, P-value 〈 0.0001 ）.A continuous dichotomous beta gauge monitor was used to characterize the hourly content of PM2.5, PM10-2.5, and Black Carbon （BC） over a 12-month period in an urban street canyon of Hong Kong. Hourly vehicle counts for nine vehicle classes and meteorological data were also recorded. The average weekly cycles of PM2.5, PM10-2.5, and BC suggested that all species are related to traffic, with high concentrations on workdays and low concentrations over the weekends. PM2.s exhibited two comparable concentrations at 10：00-11：00 （63.4 μg/m3） and 17：00-18：00 （65.0 p.g/m3 ） local time （LT） during workdays, correspond- ing to the hours when the numbers of diesel-fueled and gasoline-fueled vehicles were at their maximum levels： 3179 and 2907 h-1, respectively. BC is emitted mainly by diesel-fueled vehicles and this showed the highest concentration （31.2μg/m3） during the midday period （10：00-11：00 LT） on workdays. A poor correlation was found between PM2.s concentration and wind speed （R= 0.51, P-value 〉 0.001 ）. In contrast, the concentration of PM10-2.s was found to depend upon wind speed and it increased with obvious statistical significance as wind speed increased （R = 0,98, P-value 〈 0.0001 ）.

关 键 词：PM2.5 PMl0 2.5BCHong KongUrban street canyon 

分 类 号：X831[环境科学与工程—环境工程]