OPEN ACCESS

Articles online

Evaluation of Atmospheric PCDD/Fs at Two High-Altitude Stations in Vietnam and Taiwan during Southeast Asia Biomass Burning

Category: Air Toxics

Volume: 16 | Issue: 11 | Pages: 2706-2715
DOI: 10.4209/aaqr.2015.11.0653
PDF | RIS | BibTeX

Kai Hsien Chi 1, Ngo Tuan Hung1,2, Chuan-Yao Lin3, Sheng-Hsiang Wang4, Chang-Feng Ou-Yang4, Chung-Te Lee5, Neng-Heui Lin4

  • 1 Institute of Environmental and Occupational Health Sciences, National Yang Ming University, Taipei 112, Taiwan
  • 2 International Health Program, National Yang Ming University, Taipei 112, Taiwan
  • 3 Research Center for Environmental Changes, Academia Sinica, Taipei 115, Taiwan
  • 4 Department of Atmospheric Sciences, National Central University, Chung-Li 32001, Taiwan
  • 5 Graduate Institute of Environmental Engineering, National Central University, Chung-Li 32001, Taiwan

Highlights

Comprehensive dioxin samplings were conducted during 7SEAS/Son La Campaign in 2011.

On 26 March 2011, the atmospheric dioxins increased to 19.1 fg I-TEQ m–3 at Mt. Lulin.

Atmospheric dioxins measured at Mt. Lulin and Son La varied followed a similar pattern.

Significant PCDFs were measured at Mt. Lulin and Son La in biomass burning events.

The WRF/Chem simulation confirms the source of dioxins attributed to Indochina.


Abstract

Dioxin and dioxin-like compounds such as polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) are persistent organic pollutants (POPs) generated through human activities. In recent times, extreme weather events such as wild fires have significantly affected the remobilization and successive bioavailability of PCDD/Fs. In Seven South East Asian Studies (7-SEAS), a Southeast Asia biomass burning event that influenced the environmental outcome and transport of PCDD/Fs in Taiwan was investigated on the basis of a climate change situation. During the 7-SEAS campaign on 20–28 March, 2011, significantly high levels of atmospheric PCDD/Fs were observed at Lulin mountain in central Taiwan and in the source region of Northern Vietnam (Son La). Measurements indicated that the patterns of variation of atmospheric PCDD/Fs at both locations were similar, but with a time lag of approximately 2 to 3 days. At Mt. Lulin, there was a significant increase of PCDD/F concentrations from 3.69 to 11.1 fg I-TEQ m–3 and 3.32 to 19.1 fg I-TEQ m–3 to reach their peaks on 23 March and 26 March. In this study, a tracer simulation using the Weather Research and Forecasting model coupled with chemistry was conducted to investigate the effects of the Southeast Asia biomass burning. The combined results of air mass paths simulation and satellite data can be used as evidence supporting the hypothesis that the source of the increasing PCDD/F level is originated from biomass-burning regions in Indochina, particularly Northern Vietnam and Northern Thailand.

Keywords

Dioxin Biomass burning Vietnam Long-range transport


Related Article

Atmospheric Deposition of Polychlorinated Dibenzo-p-Dioxins and Dibenzofurans in Two Cities of Southern China

Jinning Zhu, Haiyan Tang, Jin Xing, Wen-Jhy Lee , Ping Yan , Kangping Cui
Article In Press
DOI: 10.4209/aaqr.2017.05.0177
PDF

Part I: PM2.5 and Polychlorinated Dibenzo-p-dioxins and Dibenzofurans (PCDD/Fs) in the Ambient Air of Southern China

Haiyan Tang, Kangping Cui , Jin Xing, Jinning Zhu , Wen-Jhy Lee, John Kennedy Mwangi, Yu-Cheng Lee
Volume: 17 | Issue: 6 | Pages: 1450-1469
DOI: 10.4209/aaqr.2017.03.0117
PDF
;