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1、1. Air quality during the 2008 Beijing Olympic Games Streets D G, Fu J S, Jang C J, et al. Air quality during the 2008 Beijing Olympic gamesJ. Atmospheric environment, 2007, 41(3): 480-492. Abstract China is taking major steps to improve Beijings air quality for the 2008 Olympic Games. However, conc

2、entrations of fine particulate matter and ozone in Beijing often exceed healthful levels in the summertime. Based on the US EPAs Models-3/CMAQ model simulation over the Beijing region, we estimate that about 34% of PM2.5 on average and 3560% of ozone during high ozone episodes at the Olympic Stadium

3、 site can be attributed to sources outside Beijing. Neighboring Hebei and Shandong Provinces and the Tianjin Municipality all exert significant influence on Beijings air quality. During sustained wind flow from the south, Hebei Province can contribute 5070% of Beijings PM2.5 concentrations and 2030%

4、 of ozone. Controlling only local sources in Beijing will not be sufficient to attain the air quality goal set for the Beijing Olympics. There is an urgent need for regional air quality management studies and new emission control strategies to ensure that the air quality goals for 2008 are met. 翻 译

5、中国正在采取 重要措施来改善 2008 年 北京奥运会期间的空气质量 。然而北京的 细颗粒物和臭氧在夏季 经常 超过健康限制。基于 美国 EPA 的第三代 /CMAQ 模型 模拟 北京 区域，我们 估计在奥林匹克体育场位置 附近，大约 平均 有 34%的 PM2.5 和臭氧 异常事件中 35%-60%的 臭氧 是 来自于北京之外地区的区域传输。邻近 的河北 省和山东省以及天津 自治区 对于 北京的空气质量均有 重要 影响。在 持续 的南风 下 ，河北省 对于 北京市 PM2.5 的 贡献 率 能够达到50%-70%， 对于臭氧贡献率能够达到 20-30%.仅 控制北京当地的污染源 不足以达到奥

6、运会 的空气质量目标 。 因此 ，目前 北京 急需区域空气质量管理政策研究和新的减排控制策略来确保满足 2008 年 的空气质量 目标 。 Conclusions There is no doubt that the measures planned to limit air pollution in Beijing will greatly improve Beijings air quality for the period of the 2008 Olympic Games. But will they be sufficient to achieve the stated objectives? This study shows that, even in the limit that Beijing generates no manmade emissions, levels of fine PM and ozone could still be high and could exceed healthful levels under unfavora