Interannual variation characteristics and control of road dust in Daxing District of Beijing
CUI Hao-ran1,2, FAN Shou-bin2,3, HAN Li-hui1, LI Ting-ting2,3, QU Song2,3, LIU Jun-fang1,2, WANG Hai-bin1,2
1. Key Laboratory of Beijing on Regional Air Pollution Control, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124; 2. Beijing Municipal Research Institute of Environmental Protection, Beijing 100037; 3. National Engineering Research Center of Urban Environmental Pollution Control, Beijing 100037
Abstract:Based on the detection of silt loadings of main roads in Daxing District of Beijing from 2019 to 2020 and the road dust samples of PM10 and PM2.5 for the whole year 2020, this study sought to investigate the variation characteristics of long-term road dust accumulation by systematically analyzing the chemical composition and establishing the composition spectrum. The results showed that the annual average silt loadings of Daxing District in 2019 and 2020 was 1.05g/m2 and 0.74g/m2, respectively. In 2020, the silt loadings in Daxing District decreased by 29.5% compared with that in 2019. In 2019, the hot spots of silt loadings were scattered, and there were more high value areas of silt loadings in Daxing District. In 2020, the hot spots were concentrated in the northwest, while the cold spots were concentrated in the East. The road fugitive dust emission factors in 2020 in Daxing District were lower than those in 2019 and in most subdistricts/towns, the dust emission factors and emissions in 2020 were lower than those in 2019, showing a trend of the southeast > central > northwest. In 2020, the road dust emission in Daxing District was lower than that in 2019 and the dust emission in subdistricts/towns in the south and northwest of Daxing District was higher than that in the middle. Influenced by construction activities, in 2020, the chemical components of road PM10 and PM2.5 in Daxing District were dominated by elements related to wind-blown sand and construction activities, with Ca, Mg, Si and Al accounting for 39.39% and 41.71%, respectively.For the targeted control of the silt loadings in Daxing District, on the one hand,timely washing of transport vehicles was needed to reduce the dust entrainment amount of tires; on the other hand, the frequency of cleaning of roads from the site exit to the nearby 1km should be enhanced to reduce the radiation effect of silt loadings at the exit of construction site on surrounding roads.
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CUI Hao-ran, FAN Shou-bin, HAN Li-hui, LI Ting-ting, QU Song, LIU Jun-fang, WANG Hai-bin. Interannual variation characteristics and control of road dust in Daxing District of Beijing. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(10): 4556-4564.
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