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| Seasonal variations and source apportionment of ambient PM10 and PM2.5 at urban area of Hefei, China |
| CHEN Gang1, LIU Jia-yuan1, HUANGFU Yan-qi1, WANG Hai-ting1, SHI Guo-liang1, TIAN Ying-ze1, ZHU Yu2, LI Qing3, FENG Yin-chang1 |
1. State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China;
2. Anhui Provincial Environmental Monitoring Center Station, Hefei 230071, China;
3. Hefei Environmental Monitoring Center Station, Hefei 230031, China |
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Abstract PM10 and PM2.5 samples were collected from April, August, October and December in 2014 at urban five sites in Hefei. The concentration and chemical compositions (including elements, carbonaceous species and water soluble inorganic ions) of PM10 and PM2.5 were determined. The average PM10 and PM2.5 mass concentration was 113μg/m3, 83μg/m3, respective, which was 1.61 and 2.37 times of the annual PM10 and PM2.5 National Ambient Air Quality Standard of China. The contents of main chemical components in different particle size fractions were consistent. For instance, the content of water soluble ions was the highest, followed by carbon fractions and inorganic elements. Positive Matrix Factorization (PMF) model was performed to identify the sources of PM10 and PM2.5 at urban Hefei．Four sources significantly contributing to the observed PM10 were: secondary nitrate /sulfate, coal combustion, vehicle emissions and soil dust and fugitive dust, with the contributions of 32.5%, 25.9 %, 15.7% and 25.5% to PM10 mass concentration, respectively. The contributions to PM2.5 of these four sources were 38.8%, 25.9%, 9.9% and 21.7%, respectively. The regional transmission of PM10 in Hefei was evaluated by using laser radar, and the four season contribution were 13.4%, 12.9%, 13.5% and 16.4%, respectively.
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Received: 15 December 2015
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