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Evaluation of the Relative Health Risk Impact of Atmospheric PCDD/Fs in PM2.5 in Taiwan

Category: Air Toxics

Volume: 18 | Issue: 10 | Pages: 2591-2599
DOI: 10.4209/aaqr.2018.03.0094
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Ngo Tuan Hung1,2, Hsu Wei Ting1,3, Kai Hsien Chi 1

  • 1 Institute of Environmental and Occupational Health Sciences, National Yang Ming University, Taipei 11221, Taiwan
  • 2 International Health Program, National Yang Ming University, Taipei 11221 , Taiwan
  • 3 National Environmental Health Research Center, National Health Research Institutes, Miaoli 35053, Taiwan

Highlights

PCDD/F level with 135 ± 64.3 fg I-TEQ m–3 was found in industrial area.
46 to 74% PCDD/Fs partitioned in solid phase.
PM2.5 contained higher PCDD/Fs than coarse particles.
Higher exposure of PM2.5 and PCDD/F leads to higher mortality risk.


Abstract

Many studies have indicated that the largest amounts of particle-bound polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) are found on small particles, which result in them having the highest PCDD/F TEQ concentrations. Epidemiological studies have found associations between PCDD/F exposure and development of many chronic diseases such as cardiovascular disease or cancers even in low exposure populations. Recently, in many countries, the concentrations of PM2.5 and PCDD/Fs have been one of the main foci of air monitoring systems. Several researches have suggested an association between air pollutants and health outcomes. However, publications about how PM2.5 and PCDD/Fs influence the health outcome in Taiwan are still limited. In this research, the spatial concentrations of PCDD/Fs in the vapor phase and the solid phase (TSP and PM2.5) were investigated during the winter seasons from 2012 to 2014 at different sites in Taiwan. The mean PCDD/F concentrations ranged from 10.8 ± 11.0 to 135 ± 64.3 fg I-TEQ m–3, with the highest concentrations found in the samples collected at industrial parks. Over 45.5% to 73.8% of the total PCDD/F concentrations were partitioned in the solid phase, while about 35.2% to 86.3% were distributed in PM2.5. The total quantities of the PCDD/F TEQs adsorbed onto PM2.5 measured at one northern urban sampling site (1,180 ± 294 pg I-TEQ g-PM2.5–1) and one northern suburban sampling site (1,110 ± 574 pg I-TEQ g-PM2.5–1) were higher than at other sites due to the influence of local municipal solid waste incinerators and long-range transport. Moreover, a significantly higher mortality risk was found for people living in areas with higher exposure rates of PM2.5 and PCDD/Fs.

Keywords

PM2.5 Dioxin Relative risk Long-range transport


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