title: Concentration and gas-particle partitioning of hexachlorobenzene in the ambient air before and after the Beijing Olympic Games.
abstract: Systematic studies of hexachlorobenzene in the ambient air before and after the Beijing Olympic Games were carried out during July 2007 to March 2009. Air samples were collected around 20th monthly on the roof of a building near the Olympic center. The average concentration of hexachlorobenzene was 264 pg x m(-3), which was higher in winter than other seasons. However, hexachlorobenzene concentration was decreased clearly in winter in 2008 compare with in 2007 due to the implementation of a series of "Green Olympic" policies. Gas-particle partitioning shows that the increase of hexachlorobenzene levels in winter time was mainly contributed by the high total suspended particulate from combustion processes such as coal-burning and traffic emission.
authors.affiliation: State Environmental Protection Key Laboratory of Dioxin Pollution Control, National Research Center for Environmental Analysis and Measurement, No. 1 Yuhuinanlu, Chaoyang District, Beijing 100029, China. lifei.zhang@yahoo.com.cn
authors.forename: Lifei
authors.initials: L
authors.lastname: Zhang
authors.forename: Yeru
authors.initials: Y
authors.lastname: Huang
authors.forename: Shuangxin
authors.initials: S
authors.lastname: Shi
authors.forename: Li
authors.initials: L
authors.lastname: Zhou
authors.forename: Ting
authors.initials: T
authors.lastname: Zhang
authors.forename: Liang
authors.initials: L
authors.lastname: Dong
authors.forename: Dingding
authors.initials: D
authors.lastname: Shao
mesh_terms: D000388:Air; D000393:Air Pollutants / Q000032:analysis* / Q000737:chemistry; D002681:China; D002947:Cities; D004784:Environmental Monitoring; D006581:Hexachlorobenzene / Q000032:analysis*; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D012621:Seasons; D013177:Sports; D013696:Temperature; D013997:Time Factors; D001335:Vehicle Emissions / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D052638:Particulate Matter; D001335:Vehicle Emissions; D006581:Hexachlorobenzene