Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 7 5 2007 10.5194/acpd-7-14707-2007 http://www.atmos-chem-phys-discuss.net/7/14707/2007/ http://www.atmos-chem-phys-discuss.net/7/14707/2007/acpd-7-14707-2007.html http://www.atmos-chem-phys-discuss.net/7/14707/2007/acpd-7-14707-2007.pdf 14707 14745 2007-10-16 Volatile Organic Compound (VOC) measurements in the Pearl River Delta (PRD) region, China Y. Liu M. Shao mshao@pku.edu.cn S. H. Lu C.-C. Chang J.-L. Wang G. Chen State Joint Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, China Res. Center of Environment Change, Academia Sinica, Nankang, Taipei 115, Taiwan, China Department of Chemistry, National Central University, Chungli 320, Taiwan, China NASA Langley Research Center, Hampton, VA 23681, USA We measured levels of ambient volatile organic compounds (VOCs) at seven sites in the Pearl River Delta (PRD) region of China during the Air Quality Monitoring Campaign spanning 4 October to 3 November 2004. Two of the sites, Guangzhou (GZ) and Xinken (XK), were intensive sites at which we collected multiple daily canister samples. The observations reported here provide a look at the VOC distribution, speciation, and photochemical implications in the PRD region. Alkanes constituted the largest percentage (>40%) in mixing ratios of the quantified VOCs at six sites; the exception was one major industrial site that was dominated by aromatics (about 52%). 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