title: Ambient levels of atmospheric carbonyls in Beijing during the 2008 Olympic Games.
abstract: The measurements of atmospheric carbonyls concentrations in Beijing were conducted from 12 July to 8 October, 2008, covering the periods of the 2008 Olympic Games and Paralympic Games. Six carbonyls, including formaldehyde, acetaldehyde, acetone, butyraldehyde, valeraldehyde, and hexaldehyde, were identified in all air samples. The total average concentrations of these carbonyls before, during, and after traffic restriction were (48.1 +/- 15.2), (36.6 +/- 14.5) and (23.4 +/- 12.3) microg/m3, respectively. Compared with the period after traffic restriction, the distinct high concentrations of the carbonyls before and during traffic restriction were primarily ascribed to the remarkable contribution of photochemical reactions. With respect to our previous investigation in the summer of 2005, the reductions of formaldehyde, acetaldehyde and acetone during traffic restriction period were about 64%, 47% and 27%, respectively, indicating that the air cleaning actions adopted by the Chinese government for the two games were efficient. The lowest levels of atmospheric carbonyls and the extremely high composition proportion of acetone after the traffic restriction were mainly attributed to the long-term effect of the control measures for the two games.
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. xuzhu610@163.com
authors.forename: Zhu
authors.initials: Z
authors.lastname: Xu
authors.forename: Junfeng
authors.initials: J
authors.lastname: Liu
authors.forename: Yujie
authors.initials: Y
authors.lastname: Zhang
authors.forename: Peng
authors.initials: P
authors.lastname: Liang
authors.forename: Yujing
authors.initials: Y
authors.lastname: Mu
mesh_terms: D000079:Acetaldehyde / Q000032:analysis; D000096:Acetone / Q000032:analysis; D000393:Air Pollutants / Q000032:analysis*; D000447:Aldehydes / Q000032:analysis; D002681:China; D004784:Environmental Monitoring / Q000379:methods*; D005557:Formaldehyde / Q000032:analysis
chemical_list: D000393:Air Pollutants; D000447:Aldehydes; D000096:Acetone; D005557:Formaldehyde; D000079:Acetaldehyde; C018475:butyraldehyde