• Takashi Yorifuji, Ichiro Kawachi, Tetsuro Sakamoto, and Hiroyuki Doi.
• Department of Epidemiology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama, 700-8558, Japan. yorichan@md.okayama-u.ac.jp
• J. Occup. Environ. Med. 2011 Feb 1;53(2):124-6.

ObjectiveEvidence linking short-term exposure to outdoor air pollution with hemorrhagic stroke is inconsistent.MethodsWe evaluated the associations between outdoor air pollution and specific types of stroke in Tokyo, Japan, from April 2003 to December 2008. We obtained daily counts of stroke mortality (n = 41,440) and concentrations of nitrogen dioxide as well as particles less than 2.5 μm in diameter. Time-series analysis was employed.ResultsAlthough same-day air pollutants were positively associated with ischemic stroke and intracerebral hemorrhage mortality, both air pollutants were more strongly associated with subarachnoid hemorrhage mortality: rate ratio was 1.041 (95% confidence interval: 1.011-1.072) for each 10 μg/m3 increase in the previous-day particles less than 2.5 μm.ConclusionsThis study suggests that short-term exposure to outdoor air pollution increases the risks of hemorrhagic stroke mortality as well as ischemic stroke mortality.

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