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Environmental Science and Pollution Research

, Volume 24, Issue 22, pp 18619–18629 | Cite as

Volatile organic compounds (VOCs) during non-haze and haze days in Shanghai: characterization and secondary organic aerosol (SOA) formation

  • Deming Han
  • Zhen Wang
  • Jinping ChengEmail author
  • Qian Wang
  • Xiaojia Chen
  • Heling Wang
Research Article

Abstract

To better understand the characterization and secondary organic aerosol (SOA) formation of volatile organic compounds (VOCs) during non-haze and haze days, ambient VOCs were continuously measured by a vehicle-mounted online thermal desorption system coupled with a gas chromatography–mass spectrometry (TD–GC/MS) system in Shanghai, China. The average concentrations of VOCs in haze episodes (193.2 μg m−3) were almost 50% higher than in non-haze periods (130.8 μg m−3). VOC concentrations exhibited a bi-modal pattern in the morning and evening rush hour periods on both non-haze and haze days. The ratios of toluene to benzene (T/B) and m,p-xylene to ethylbenzene (X/E) indicated that VOCs were aged air mass transported from nearby areas. The estimated SOA yields were 12.6 ± 5.3 and 16.7 ± 6.7 μg m−3 for non-haze and haze days, respectively, accounting for 9.6 and 8.7% of the corresponding PM2.5 concentrations, which were slightly underestimated. VOCs–sensitivity (VOCs–S) based on a PM2.5-dependent model was used to investigate the variation between VOCs and PM2.5 concentrations in the morning rush hour. It was found that VOCs were more sensitive to PM2.5 on clean days than during periods of heavy particulate pollution. VOCs–sensitivity was significantly correlated with the ratio of specific PM2.5 to background PM2.5, with a simulated equation of y = 0.84x−0.62 (r 2 = 0.93, p < 0.001). Our findings suggest that strategies to mitigate VOC emissions and further alleviate haze episodes in Shanghai based on reducing gasoline vehicle-related sources would be very efficient.

Keywords

VOCs Haze Secondary organic aerosol (SOA) PM2.5 Shanghai Sensitivity 

Notes

Acknowledgments

This study was financially supported by the National Natural Science Foundation of China (nos. 21177087 and 21577090), and the Shanghai Environmental Protection Bureau Program (no. 00-16-22988).

Supplementary material

11356_2017_9433_MOESM1_ESM.doc (1008 kb)
ESM 1 (DOC 1008 kb)

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Deming Han
    • 1
  • Zhen Wang
    • 2
  • Jinping Cheng
    • 1
    Email author
  • Qian Wang
    • 3
  • Xiaojia Chen
    • 1
  • Heling Wang
    • 1
  1. 1.School of Environmental Science and EngineeringShanghai Jiao Tong UniversityShanghaiChina
  2. 2.Shanghai Environmental Monitor CenterShanghaiChina
  3. 3.Department of Civil and Environmental EngineeringNational University of SingaporeSingaporeSingapore

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