Ambient levels of atmospheric carbonyls in Beijing during
the 2008 Olympic Games |
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Authors: | Zhu Xu Junfeng Liu Yujie Zhang Peng Liang and Yujing Mu |
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Institution: | 1. Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;Graduate School of Chinese Academy of Sciences,Beijing 100039,China 2. Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China |
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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 tra c restriction were (48.1 15.2), (36.6 14.5) and (23.4 12.3) g/m3, respectively. Compared with
the period after tra c restriction, the distinct high concentrations of the carbonyls before and during tra c 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 tra c 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 e cient. The lowest levels of
atmospheric carbonyls and the extremely high composition proportion of acetone after the tra c restriction were mainly attributed to
the long-term e ect of the control measures for the two games. |
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Keywords: | Olympic Games Paralympic Games carbonyl compounds tra c restriction photochemical reactions vehicular exhaust |
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