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| Effect of Dust Process on Air Quality in Cities of Northern China |
| Chen Jie1, Zhao Suping2, Yin Daiying2, Qu Jianjun2 |
1. Huixian Meteorological Bureau, Huixian 742300, Gansu, China;
2. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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Abstract In order to investigate effect of dust process on air quality in cities of Northern China, the particulate concentration (PM2.5 and PM10) and gaseous pollutant concentration (SO2, NO2, O3 and CO) and meteorological data were measured in 13 cities of Northern China during a serious regional dust process occurred on April 23-25, 2014. Sources of dust were identified using backward trajectory model and spatial distributions of MODIS deep-blue AOD (Aerosol Optical Depth). The dust particles originated from the Taklimakan Desert and its outer edge, passed through desert areas in northwestern Gansu, western and central Inner Mongolia, and affected downstream cities. The horizontal movement characteristics of dust particles could be seen from spatial distributions of MODIS deep-blue AOD. The PM2.5 and PM10 mass concentrations increased by 7.5%-1 141.2% and 344.0%-2 562.1% in northern cities of China during the dust process, respectively. In addition, the dust process alleviated gaseous pollutants concentrations effectively such as SO2, NO2 and CO, but it had a less effect on O3 concentration. The decreases of mean concentrations of SO2, NO2 and CO were more significant in Yinchuan, Datong and Korla during the dust process than during non-dust event, which were 80.0%, 78.7% and 62.1% lower, respectively.
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Received: 01 October 2014
Published: 20 March 2015
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2015, Vol. 35 
