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Int. J. Environ. Res. Public Health 2017, 14(2), 189;

Gaseous Air Pollution and the Risk for Stroke Admissions: A Case-Crossover Study in Beijing, China

3,* and 1,2,*
School of Public Health, Capital Medical University, Beijing 100069, China
Beijing Municipal Key Laboratory of Clinical Epidemiology, Beijing 100069, China
Beijing Public Health Information Center, Beijing 100050, China
Authors to whom correspondence should be addressed.
Academic Editor: Sayed M. Hassan
Received: 25 November 2016 / Revised: 15 January 2017 / Accepted: 27 January 2017 / Published: 14 February 2017
(This article belongs to the Special Issue Environmental Pollution and Human Health Risk)
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Background: Though increasing evidence supports association between gaseous air pollution and stroke, it remains unclear whether the effects differ in season, sex and age. The aim of this study was to examine the associations of gaseous air pollution with stroke admissions in Beijing, 2013–2014 in different subgroups. Methods: Case-crossover design and conditional logistic regression were used to perform the analyses. We examined the exposure-response relationship between air pollution and stroke. Stratified analyses were performed in different seasons, sex, and age groups. Results: There were 147,624 stroke admissions during the study period. In the whole study period, percent changes of stroke admissions were 0.82% (95% CI: 0.52% to 1.13%) and 0.73% (95% CI: 0.44% to 1.03%) per 10 μg/m3 increase in the same day conentration of nitrogen dioxide (NO2) and sulfur dioxide (SO2). The positive associations were higher in warm seasons and with patients >65 years (p < 0.05). Contrary effects of carbon monoxide (CO) and ozone on stroke admissions were observed in different seasons. Conclusions: NO2 and SO2 were positively associated with stroke admissions, with stronger effects in warm seasons and with patients >65 years. The associations of CO and ozone with stroke admissions differed across seasons. View Full-Text
Keywords: stroke; air pollution; hospital admission; exposure-response relationship stroke; air pollution; hospital admission; exposure-response relationship

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Huang, F.; Luo, Y.; Tan, P.; Xu, Q.; Tao, L.; Guo, J.; Zhang, F.; Xie, X.; Guo, X. Gaseous Air Pollution and the Risk for Stroke Admissions: A Case-Crossover Study in Beijing, China. Int. J. Environ. Res. Public Health 2017, 14, 189.

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