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Source Apportionment and Risk Assessment of Atmospheric Polycyclic Aromatic Hydrocarbons in Lhasa, Tibet, China

Category: Air Pollution and Health Effects

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DOI: 10.4209/aaqr.2017.12.0603
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Pengfei Chen1, Shichang Kang 1,2, Chaoliu Li2,3, Quanlian Li1, Fangping Yan4, Junming Guo1, Zhenming Ji3, Qianggong Zhang2,3, Zhaofu Hu1, Lekhendra Tripathee1, Mika Sillanpää4,5

  • 1 State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences (CAS), Lanzhou 730000, China
  • 2 CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100085, China
  • 3 Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, CAS, Beijing 100101, China
  • 4 Laboratory of Green Chemistry, Lappeenranta University of Technology, 50130 Mikkeli, Finland
  • 5 Department of Civil and Environmental Engineering, Florida International University, Miami, FL-33174, USA

Highlights

Atmospheric PAHs are more prevalent in Lhasa than in more remote sites in Tibet.
PMF model indicated that biomass and vehicle emissions are the main PAH sources.
Lifetime carcinogenic risk analysis revealed that PAHs pose no such risk to locals.


Abstract

Much attention is given to the distributions, sources, and health risks of atmospheric polycyclic aromatic hydrocarbons (PAHs) in cities. In this study, 62 total suspended particle samples were collected from April 2013 to March 2014 in Lhasa city. Positive matrix factorization (PMF) was applied to investigate the source apportionment of 15 priority PAHs, the lifetime carcinogenic risk (LCR) levels of which were assessed. The annual average particle phase PAH concentration was 43.9 ± 60.4 ng m–3. Evident seasonal variations of PAHs were observed, with the highest concentration observed in winter, followed by autumn, spring, and summer in descending order. Four- and five-ring PAHs accounted for the predominant proportion (63.3%–84.4%) throughout the year. Correspondingly, gas phase PAHs showed opposite variations with the highest and lowest concentrations observed in summer and winter, respectively. And three-ring PAHs especially Ace, Acel, and Flu contributed most. Compositions of particle phase PAHs varied seasonally, with four-ring PAHs contributing more in winter than in summer and five-ring PAHs exhibiting the opposing trend, thereby reflecting the variety of emission sources. PMF analysis showed that biomass combustion (48.4%) and vehicle emissions (27.9%) were the main two PAH sources, followed by coal combustion and air–surface exchange. These results were consistent with those of diagnostic molecular ratios. The benzo(a)pyrene equivalent (BaPeq) concentration of particle phase PAHs ranged between 1.48 and 24.5 ng m–3, all of which were higher than the new limit value in China (1 ng m–3). The average BaPeq of gas phase PAHs were 6.43 ± 4.15 ng m–3, which were similar with those of particle phase PAHs. The LCR of total PAHs (9.08 × 10–6) was one time higher than that of particle phase, however, a little lower than the acceptable level, thereby indicating that atmospheric PAHs in Lhasa pose no or little carcinogenic risk to locals.

Keywords

Polycyclic aromatic hydrocarbons Source apportionment Health risk Tibetan Plateau


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