Effect of road dust on air quality in Beijing
XU Yan-ling, CHENG Shui-yuan, CHEN Dong-sheng, ZHAO Xiu-yong, GUO Xiu-rui(College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, China)
The purpose of this paper is to report the authors' quantitative analysis of the effect of road dust on the air quality in Beijing Municipality. For the analysis convenience, we set up an integrated modeling system consisting of meteorological model ARPS and the air quality model Models-3/CMAQ. The study sphere is restricted in a two-level-nested grid domain with spatial resolutions of 12 km and 4 km respectively. Based on the regional meteorological data provided by China Meteorological Administration, the emission inventory of Beijing and the surrounding provinces, the space-time variation of the PM_ 10 concentration in January, April, August and October of 2002 in Beijing were simulated by the integrated ARPS-CMAQ modeling system. The model performance evaluation shows a satisfactory agreement between the modeled and the observed data. The integrated modeling system was then used to simulate the two emission scenarios devised. Then the effect of the road dust on PM_ 10 in Beijing on the target months of the four seasons in 2002 were observed and investigated. The results of our investigation and analysis suggest that the hourly PM_ 10 pollution contribution ratio of the road dust emission on the four target months fluctuates remarkably, with its biggest contribution radio being 33% and the smallest being 3%. Thus, from the analysis, it can be seen that road dust emission source plays an significant role in the PM_ 10 air quality in Beijing; the average pollution distribution ratio of the four target months is 16.73%, 12.92%, 18.56%, 18.17%, while the average pollution contribution concentration is 27.61 μg/m~3, 32.80 μg/m~3, 25.20 μg/m~3 and 24.40 μg/m~3 , respectively. However, there is no obvious difference of the monthly average pollution distribution in January, August and October, according to the simulated results, the contaminating characteristics and the controlled actuality. It is particular that the high contribution concentration but the low contribution ratio appears in April. More active measures should be taken to alleviate the adverse effect of such dust spreading.
【Fund】： 国家科技部973项目(2005CB724201);; 北京市科技计划项目(8061001)
【CateGory Index】： X823
【CateGory Index】： X823