title: An index for estimating the potential metal pollution contribution to atmospheric particulate matter from road dust in Beijing.
abstract: The resuspension of road dust from street surfaces could be a big contributor to atmospheric particulate pollution in the rapid urbanization context in the world. However, to date what its potential contribution to the spatial pattern is little known. Here we developed an innovative index model called the road dust index (RI<105μm) and it combines source and transport factors for road dust particles <105μm in diameter. It could quantify and differentiate the impact of the spatial distribution of the potential risks posed by metals associated with road dust on atmospheric suspended particles. The factors were ranked and weighted based on road dust characteristics (the amounts, grain sizes, and mobilities of the road dust, and the concentrations and toxicities of metals in the road dust). We then applied the RI<105μm in the Beijing region to assess the spatial distribution of the potential risks posed by metals associated with road dust on atmospheric suspended particles. The results demonstrated that the road dust in urban areas has higher potential risk of metal to atmospheric particles than that in rural areas. The RI<105μm method offers a new and useful tool for assessing the potential risks posed by metals associated with road dust on atmospheric suspended particles and for controlling atmospheric particulate pollution caused by road dust emissions.
authors.affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing 100085, China.
authors.forename: Hongtao
authors.initials: H
authors.lastname: Zhao
authors.affiliation: Institute for Geophysics and Meteorology, University of Cologne, Cologne 50923, Germany.
authors.forename: Yaping
authors.initials: Y
authors.lastname: Shao
authors.affiliation: State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing 100085, China.
authors.forename: Chengqing
authors.initials: C
authors.lastname: Yin
authors.affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing 100085, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Jiang
authors.affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing 100085, China. Electronic address: xyli@rcees.ac.cn.
authors.forename: Xuyong
authors.initials: X
authors.lastname: Li
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000706:statistics & numerical data*; D001272:Atmosphere / Q000737:chemistry; D000068476:Beijing; D004391:Dust / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods*; D008670:Metals / Q000032:analysis*; D008956:Models, Chemical; D052638:Particulate Matter / Q000032:analysis
chemical_list: D000393:Air Pollutants; D004391:Dust; D008670:Metals; D052638:Particulate Matter
keywords: Atmospheric particulate pollution; Metal pollution; Risk assessment methods; Road dust particle; Urban–rural gradient