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Environmental Science and Pollution Research

, Volume 24, Issue 1, pp 135–145 | Cite as

Variations of polycyclic aromatic hydrocarbons in ambient air during haze and non-haze episodes in warm seasons in Hangzhou, China

  • Hao Lu
  • Shengsheng Wang
  • Zuliang Wu
  • Shuiliang Yao
  • Jingyi Han
  • Xiujuan Tang
  • Boqiong Jiang
Research Article

Abstract

To investigate the characteristics of polycyclic aromatic hydrocarbons (PAHs) during haze episodes in warm seasons, daily PM2.5 and gaseous samples were collected from March to September 2015 in Hangzhou, China. Daily samples were further divided into four groups by the definition of haze according to visibility and relative humidity (RH), including non-haze (visibility, >10 km), light haze (visibility, 8–10 km, RH <90 %), medium haze (visibility, 5–8 km, RH <90 %), and heavy haze (visibility, <5 km, RH <90 %). Significantly higher concentrations of PM2.5-bound PAHs were found in haze days, but the mean PM2.5-bound PAH concentrations obviously decreased with the aggravation of haze pollution from light to heavy. The gas/particle partitioning coefficients of PAHs decreased from light-haze to heavy-haze episodes, which indicated that PM2.5-bound PAHs were restricted to adhere to the particulate phase with the aggravation of haze pollution. Absorption was considered the main mechanism of gas/particle partitioning of PAHs from gaseous to particulate phase. Analysis of air mass transport indicated that the PM2.5-bound PAH pollution in haze days was largely from regional sources but also significantly affected by long-range air mass transport. The inhalation cancer risk associated with PAHs exceeded the acceptable risk level markedly in both haze and non-haze days.

Keywords

Haze Polycyclic aromatic hydrocarbons Gas/particle partitioning Air mass transport Inhalation cancer risk 

Notes

Acknowledgments

This work was supported by grants from the Science and Technology Department of Zhejiang Province (2016C33015) and the National Natural Science Foundation of China (51106138).

Supplementary material

11356_2016_7303_MOESM1_ESM.docx (93 kb)
ESM 1 (DOCX 92 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.School of Environmental Science and EngineeringZhejiang Gongshang UniversityHangzhouChina

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