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Int. J. Environ. Res. Public Health 2016, 13(3), 347; doi:10.3390/ijerph13030347

The Effects of Coarse Particles on Daily Mortality: A Case-Crossover Study in a Subtropical City, Taipei, Taiwan

1
Division of Pulmonary and Critical Medicine, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan
2
Graduate Institute of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan
3
Department of Pharmacology, College of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan
4
Department of Public Health, College of Health Sciences, Kaohsiung Medical University, Kaohsiung 807, Taiwan
5
Division of Environmental Health and Occupational Medicine, National Health Research Institute, Miaoli 350, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Paul B. Tchounwou
Received: 1 December 2015 / Revised: 11 March 2016 / Accepted: 14 March 2016 / Published: 22 March 2016
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Abstract

Many studies have examined the effects of air pollution on daily mortality over the past two decades. However, information on the relationship between levels of coarse particles (PM2.5–10) and daily mortality is relatively sparse due to the limited availability of monitoring data. Furthermore, the results are inconsistent. In the current study, the association between coarse particle levels and daily mortality in Taipei, Taiwan’s largest city, which has a subtropical climate, was undertaken for the period 2006–2008 using a time-stratified case-crossover analysis. For the single pollutant model (without adjustment for other pollutants), PM2.5–10 showed statistically significant association with total mortality both on warm and cool days, with an interquartile range increase associated with a 11% (95% CI = 6%–17%) and 4% (95% CI = 1%–7%) rise in number of total deaths, respectively. In two-pollutant models, PM2.5–10 remained significant effects on total mortality after the inclusion of SO2 and O3 both on warm and cool days. We observed no significant associations between PM2.5–10 and daily mortality from respiratory diseases both on warm and cool days. For daily mortality from circulatory diseases, the effect of PM2.5–10 remained significant when SO2 or O3 was added in the regression model both on warm and cool days. Future studies of this type in cities with varying climates and cultures are needed. View Full-Text
Keywords: coarse particulate; air pollution; daily mortality; case-crossover coarse particulate; air pollution; daily mortality; case-crossover
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Cheng, M.-H.; Chiu, H.-F.; Yang, C.-Y. The Effects of Coarse Particles on Daily Mortality: A Case-Crossover Study in a Subtropical City, Taipei, Taiwan. Int. J. Environ. Res. Public Health 2016, 13, 347.

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