Associations of outdoor air pollution with hemorrhagic stroke mortality

Takashi Yorifuji, Ichiro Kawachi, Tetsuro Sakamoto, Hiroyuki Doi

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)


OBJECTIVE: Evidence linking short-term exposure to outdoor air pollution with hemorrhagic stroke is inconsistent. METHODS: We 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. RESULTS: Although 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/m increase in the previous-day particles less than 2.5 μm. CONCLUSIONS: This study suggests that short-term exposure to outdoor air pollution increases the risks of hemorrhagic stroke mortality as well as ischemic stroke mortality.

Original languageEnglish
Pages (from-to)124-126
Number of pages3
JournalJournal of occupational and environmental medicine
Issue number2
Publication statusPublished - Feb 2011

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health


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