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A Time-series Study on Relationship between Visibility as an Indicator of Air Pollution and Daily Respiratory Mortality

대기오염 지표로서의 시정과 일별 호흡기계 사망간의 연관성에 관한 시계열적 연구

  • Cho, Yong-Sung (Department of Public Health, Graduate School of Hanyang University) ;
  • Jung, Chang-Hoon (Department of Environmental Health, Kyungin Women's College) ;
  • Son, Ji-Young (Department of Public Health, Graduate School of Hanyang University) ;
  • Chun, Young-Sin (Typoon and Asian Dust Research Laboratory, Meteorological Research Institute) ;
  • Lee, Jong-Tae (Department of Public Health, Graduate School of Hanyang University)
  • 조용성 (한양대학교 일반대학원 보건학과) ;
  • 정창훈 (경인여자대학 환경보건과) ;
  • 손지영 (한양대학교 일반대학원 보건학과) ;
  • 전영신 (기상연구소 태풍황사연구팀) ;
  • 이종태 (한양대학교 일반대학원 보건학과)
  • Published : 2007.10.31

Abstract

There seems to be a consensus among most people that visibility impairment is the most obvious indicator of air pollution. While considerable evidence on the association between air pollution and health outcomes including death and disease have been established, based on industrial complex areas or huge urban cities, time-series, case-crossover and cohort studies, scarce literature exists on the direct evidence for the association between visibility and adverse health outcomes. Our study is assessed the effect of air pollution measured by visibility impairment on respiratory mortality over a period of six years. Relative risks in respiratory deaths were estimated by a Poisson regression model of daily deaths between $1999{\sim}2004$. Daily counts of respiratory deaths as dependent variable was modelled with daily 24-hr mean visibility measurements (kilometers) as independent variable by means of Poisson regression. This model is controlled for confounding factors such as day of weeks, weather variables, seasonal variables and $PM_{10}$. The results in this study is observed the statistically significant association between an inverse health effect and visibility during the study period for respiratory mortality (percentage change in the relative risk for all aged -0.57%, 95% Cl, $-1.01%{\sim}-0.12%$; for $0{\sim}15$ aged -7.12%, 95% Cl, $-13.29%{\sim}-0.51%$; for 65+ aged -0.43%, 95% Cl, $-0.93%{\sim}-0.06%$ per 1 km increased in visibility). The effect size was much reduced during warm season. Visibility impairment resulting from air pollution is strongly associated with respiratory mortality, especially for children may be spent at outdoor. Our result provides a quick and useful indicator for eliciting the contribution of air pollution to the excess risk of respiratory mortality in Seoul, Korea.

Keywords

References

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