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A Time-Series Study of Ambient Air Pollution in Relation to Daily Death Count in Daejeon, 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-Shin (Institute of Environmental and Industrial Medicine, Hanyang University)
Publication Information
Journal of Environmental Impact Assessment / v.13, no.1, 2004 , pp. 9-19 More about this Journal
Abstract
This study is performed to examine the relationship between air pollution exposure and mortality in Daejeon 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(4 day before), $O_3$(current day), $PM_10$(4 day before), $NO_2$(6 day before), $SO_2$(2 day before). Increase of $31.07{\mu}g/m^3$(interquartile range) in $PM_10$ was associated with 2.0 % (95% CI = 0.5 % - 3.5 %)) increase in the daily number of death. This effect was greater in children(less than 15 aged) and elderly(more than 65 aged). We concluded that Daejeon had 2 - 4 % increase in mortality in association with IQR in air pollutants. Daily variations in air pollution within the range currently occurring in Daejeon 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 except PM10, is harmful to sensitive subjects, such as children or elderly.
Keywords
Air pollution; Daily death counts; Time-series analysis; General additive model;
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