Epidemiological study on health effects of automobile exhaust in Japan and China

空气中颗粒物(PM)的浓度主要来自汽车尾气，北京和武汉中国比日本东京高得多。提示PM对北京地区老年人肺功能的急性影响。然而，在2008年奥运会期间，空气中PM浓度显著下降，对肺功能没有影响。中国还在武汉观察了学生肺功能与细颗粒物和元素碳浓度的关系。在日本东京，过敏者被认为更容易受到空气污染的影响。

The concentrations of airborne particulate matter (PM), derived primarily from automobile exhaust, were considerably higher in Beijing and Wuhan, China than in Tokyo, Japan. The acute effects of PM on pulmonary function among elderly subjects in Beijing were suggested. However, the airborne PM concentrations decreased markedly during the 2008 Olympic Games, and no effect on pulmonary function was observed. The associations between pulmonary function among students and the concentrations of fine PM and elemental carbon were also observed in Wuhan, China. Allergic subjects are considered to be more susceptible to air pollution in Tokyo, Japan.