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Short-term Effects of Ambient PM2.5 and PM2.5-10 on Mortality in Major Cities of Korea

Category: Impact of Aerosol on Health and Environment

Volume: 18 | Issue: 7 | Pages: 1853-1862
DOI: 10.4209/aaqr.2017.11.0490
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Tae-Young Kim1, Ho Kim2,3, Seung-Muk Yi1,2, Jang-Pyo Cheong 4, Jongbae Heo 5

  • 1 Department of Environmental Health, Graduate School of Public Health, Seoul National University, Seoul, Korea
  • 2 Institute of Health and Environment, Graduate School of Public Health, Seoul National University, Seoul, Korea
  • 3 Department of Public Health, Graduate School of Public Health, Seoul National University, Seoul, Korea
  • 4 Department of Civil and Environmental Engineering, Kyungsung University, Busan, Korea
  • 5 Center for Healthy Environment Education and Research, Graduate School of Public Health, Seoul National University, Seoul, Korea

Highlights

Time series data of fine and coarse particles were compared with deaths in Korea.
Particulate matter had the greatest effect on respiratory mortality.
The results showed regional differences in the effects of air pollution.
Fine particles were associated with higher adverse health effects.


Abstract

While many epidemiological studies have examined the health effects of different sizes of ambient particulate matter (PM), the findings have been mixed. PM is a heterogeneous mixture, and its chemical components differ by size, with more combustion related materials in the fine mode and more crustal materials in the coarse mode. This study estimates the risk of mortality associated with exposure to PM2.5 (particulate matter less than 2.5 µm in aerodynamic diameter) and PM2.5-10 (particulate matter less than 10 µm and greater than 2.5 µm in aerodynamic diameter). Long-term measurements of PM2.5 and PM2.5-10 were compared with the all-cause, cardiovascular, and respiratory mortality observed from January 2006 till December 2012 in three large cities in Korea (viz., Seoul, Busan, and Incheon). A time-series analysis based on a quasi-Poisson distribution was used to evaluate the associations of PM2.5 and PM2.5-10 with mortality. A 10 µg m−3 increase in PM2.5 (lag01) was associated with an increase of 1.18% (95% CI: 0.64, 1.72), 0.34% (95% CI: 0.03, 0.64), and 0.43% (90% CI: 0.02, 0.95) in the all-cause mortality in Busan, Seoul, and Incheon, respectively, during the study period. An increase in respiratory mortality of 0.52% (95% CI: 0.09, 0.96) and 2.25% (95% CI: 0.38, 4.15) was associated with a 10 µg m–3 increase in PM2.5 (lag01) in Seoul and Busan, respectively. Overall, the strongest associations were observed in Busan as well as among the elderly population. Statistically significant associations between ambient PM2.5 and PM2.5-10, and mortality were observed in this study. Exposure to fine particles, which mostly originate in combustion and mobile emissions, showed stronger effects on human health than coarse particles, which mostly originate in natural sources such as soil and mechanical processes.

Keywords

Coarse particles Fine particles Health effects Time-series analysis


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