Impact of biomass burning on urban air quality estimated by organic tracers: Guangzhou and Beijing as cases |
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| Institution: | 1. State Joint Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences, Peking University, Beijing 100871, China;2. Earth System Research Laboratory, U.S. Department of Commerce, Boulder, CO 80305, USA;1. Department of Environmental Science and Technology, School of Environmental Studies, China University of Geosciences, Wuhan 430074, China;2. Department of Atmospheric Sciences, School of Environmental Studies, China University of Geosciences, Wuhan 430074, China;3. Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou 310027, China;4. Beijing Weather Modification Office, Beijing 100089, China;5. College of Urban and Environmental Sciences, Peking University, Beijing 100871, China;6. School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China;7. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China;1. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, China;2. State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Beijing, China;3. Collaborative Innovation Center for Regional Environmental Quality, China;4. School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA;5. Department of Civil and Environmental Engineering, University of California, Davis, CA, USA;1. Key Lab of Aerosol Chemistry and Physics, SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an, 710061, China;2. Institute of Environmental Engineering, National Chiao Tung University, No. 1001, Univ. Road, Hsinchu, Taiwan, 300, Taiwan;3. South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou, 510655, China |
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| Abstract: | The impacts of biomass burning have not been adequately studied in China. In this work, chemical compositions of volatile organic compounds and particulate organic matters were measured in August 2005 in Beijing and in October 2004 in Guangzhou city. The performance of several possible tracers for biomass burning is compared by using acetonitrile as a reference compound. The correlations between the possible tracers and acetonitrile show that the use of K+ as a tracer could result in bias because of the existence of other K+ sources in urban areas, while chloromethane is not reliable due to its wide use as industrial chemical. The impact of biomass burning on air quality is estimated using acetonitrile and levoglucosan as tracers. The results show that the impact of biomass burning is ubiquitous in both suburban and urban Guangzhou, and the frequencies of air pollution episodes significantly influenced by biomass burning were 100% for Xinken and 58% for downtown Guangzhou city. Fortunately, the air quality in only 2 out of 22 days was partly impacted by biomass burning in August in Beijing, the month that 2008 Olympic games will take place. The quantitative contribution of biomass burning to ambient PM2.5 concentrations in Guangzhou city was also estimated by the ratio of levoglocusan to PM2.5 in both the ambient air and biomass burning plumes. The results show that biomass burning contributes 3.0–16.8% and 4.0–19.0% of PM2.5 concentrations in Xinken and Guangzhou downtown, respectively. |
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