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A Time-Series Study of Ambient Air Pollution in Relation to Daily Mortality in Seoul, 1998∼2001  

Cho, Yong-Sung (Institute of Environmental and Industrial Medicine, Hanyang University)
Lee, Jong-Tae (Department of Preventive Medicine, Ewha Womans University)
Kim, Yoon-Sin (Institute of Environmental and Industrial Medicine, Hanyang University)
Hong, Seung-Cheol (Institute of Environmental and Industrial Medicine, Hanyang University)
Kim, Ho (Department of Epidemiology and Biostastistics, Institute of Public Health)
Ha, Eun-Hee (Department of Preventive Medicine, Ewha Womans University)
Park, Hye-Sook (Department of Preventive Medicine, Ewha Womans University)
Lee, Bo-Eun (Department of Preventive Medicine, Ewha Womans University)
Publication Information
Journal of Korean Society for Atmospheric Environment / v.19, no.6, 2003 , pp. 625-637 More about this Journal
Abstract
This study was performed to examine the relationship between air pollution exposure and mortality in Seoul for the years of 1998∼2001. Daily counts of death were analyzed by general additive Poisson model, with adjustment for effects of seasonal trend, air temperature, humidity, and day of the week as confounders in a nonparametric approach. Daily death counts were associated with CO (current day),O$_3$ (current day), PM$_{10}$ (current day), NO$_2$ (1 day before), SO$_2$ (1 day before). Increase of 41.71 $\mu\textrm{g}$/㎥ (interquartile range) in PM$_{10}$ was associated with 1.3% (95% CI = 0.7∼1.9％) increase in the daily number of death. $O_3$ concentrations resulted in an increased risk of 1.3% for 23.86 ppb in all-aged mortality [RR = 1.013 (1.004-1.023)1. This effect was greater in children (less than 15 aged) and elderly (more than 65 aged). After ozone level exceeds 25 ppb, the dose-response relationship between mortality and ozone was almost linear. We concluded that Seoul had 1∼5％ increase in mortality in association with IQR (interquartile range) in air pollutants. Daily variations in air pollution within the range currently occurring in Seoul might have an adverse effect on daily mortality. These findings also support the hypothesis that air pollution, at levels below the current ambient air quality standards of Korea, is harmful to sensitive subjects, such as children or elderly.rly.
Keywords
Air pollution; Daily death counts; Time-series analysis; Generalized additive model;
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