Abstract
Ambient PM2.5 is one of the major risk factors for human health, and is not fully explained solely by mass concentration. We examined the short-term associations of cause-specific mortality (i.e., all-cause, cardiovascular, and respiratory mortality) with the 15 chemical constituents and sources of PM2.5 in four metropolitan cities of South Korea during 2014–2018. We found transition metals consistently showed significant associations with all-cause mortality, while the effects of other constituents varied across the cities and for cause of death. Carbonaceous components strongly affected the all-cause, cardiovascular, and respiratory mortality in Daejeon. Secondary inorganic aerosols, SO42− and NH4+, showed significant associations with respiratory mortality in Gwangju. We also found the sources from which species closely linked to mortality generally increased the relative mortality risks. Heavy metal markers from soil or industrial sources were significantly associated with mortality in all cities. However, several sources influenced mortality despite their marker species not being significantly associated with it. Secondary nitrate and secondary sulfate sources were linked to mortality in DJ. This could be attributed to the deep inland location, which might have facilitated formation of secondary inorganic aerosols. In addition, primary sources including mobile and coal combustion seemed to have acute impacts on respiratory mortality in Gwangju. Our findings suggest the necessity of positive matrix factorization (PMF)-based approaches for evaluating health effects of PM2.5 while considering the spatial heterogeneity in the compositions and source contributions of PM2.5.
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This work was supported by the National Institute of Environmental Research (NIER) of the Ministry of Environment under grant no. NIER-2021–03-03–001 and NIER-2020–04-02–086 and the National Strategic Project-Fine particle (NRF-2017M3D8A1092019) of the National Research Foundation of Korea (NRF).
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Ho Kim and Seung-Muk Yi supervised study design; Inho Song, Dae-Gon Kim, and Kwonho Jeon contributed to data collection and verification; Sangcheol Kim and Juyeon Yang performed data analyses and wrote the first draft of the manuscript; Sangcheol Kim, Juyeon Yang, Jieun Park, Inho Song, Dae-Gon Kim, Kwonho Jeon, Ho Kim, and Seung-Muk Yi contributed to the interpretation of the data. All authors read and approved the final manuscript.
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Kim, S., Yang, J., Park, J. et al. Health effects of PM2.5 constituents and source contributions in major metropolitan cities, South Korea. Environ Sci Pollut Res 29, 82873–82887 (2022). https://doi.org/10.1007/s11356-022-21592-1
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DOI: https://doi.org/10.1007/s11356-022-21592-1