OPEN ACCESS

Articles online

Variation of Atmospheric PAHs in Northern Taiwan during Winter and Summer Seasons

Category: Air Pollution and Health Effects

Volume: 18 | Issue: 4 | Pages: 1019-1031
DOI: 10.4209/aaqr.2018.01.0038
PDF | Supplemental material

Export Citation:  RIS | BibTeX

Nguyen-Duy Dat, Jia-Ming Lyu, Moo-Been Chang

  • Graduate Institute of Environmental Engineering, National Central University, Taoyuan 32001, Taiwan

Highlights

The highest level is measured at urban site, followed by rural and industrial sites.
Wind direction is the main factor governing the PAH level at rural site.
Combustion of solid fuel/petroleum is major PAHs source at industrial site.
Petroleum evaporation is significant in summer at rural and urban sites.
Soot-air model reveals the importance of soot carbon in PAHs partitioning.


Abstract

Ambient air samples were collected simultaneously at three sites in winter and summer to investigate the characteristic variations of PAHs in northern Taiwan. In winter, the highest concentration was observed at urban site (225 ± 25.0 ng m–3), followed by industrial and rural sites (173 ± 28.7 and 148 ± 12.9 ng m–3, respectively). However, in summer, the highest PAHs concentration was measured at rural site (230 ± 8.0 ng m–3), followed by urban and industrial sites (205 ± 29.2 and 200 ± 44.1 ng m–3, respectively). Based on the air mass back trajectory, the air mass passing through more PAH sources before reaching the sampling site is the reason for higher PAH level being measured at rural site in summer. The highest BaP-TEQ concentration measured at rural site in summer suggests that human exposure to PAHs in summer should receive more attention. Based on the diagnostic ratios, samples collected at industrial site in two seasons are closely related to combustions of solid fuel and petroleum. At rural and urban sites, PAHs measured in winter are influenced by mixed sources of solid fuel/petroleum combustions and petroleum evaporation, while the sources of PAHs are more related to petroleum evaporation in summer. The gas/particle partitioning coefficients (Kp) correlated well with the sub-cooled liquid vapor pressures (PoL) of PAHs with the slopes higher than –1 (the r2 ranging from 0.835 to 0.909). The slope values indicate that both adsorption and absorption might govern gas/particle partitioning of PAHs. Comparison between different models reveals that adsorption of soot carbon is the major mechanism governing gas/particle partitioning.

Keywords

Junge-Pankow model Absorption KOA model Soot-air model PAHs concentration Distribution


Related Article

Characterization of Air Quality Index for both Handan and Kaifeng Cities, China

Rong Zhao, Kangping Cui , Weiwei Wang, How-Ran Chao
Accepted Manuscripts
DOI: 10.4209/aaqr.2018.06.0240
PDF

Inflammatory Response and PM2.5 Exposure of Urban Traffic Conductors

How-Ran Chao, Jhih-Wei Hsu, Hsiu-Ying Ku, Shu-Li Wang, Han-Bin Huang, Saou-Hsing Liou, Tsui-Chun Tsou
Accepted Manuscripts
DOI: 10.4209/aaqr.2018.04.0132
PDF

Outpatient Visits for Allergic Diseases are Associated with Exposure to Ambient Fungal Spores in the Greater Taipei Area

Kraiwuth Kallawicha, Ying-Chih Chuang, Shih-Chun Candice Lung, Chang-Fu Wu, Bor-Cheng Han, Yi-Fang Ting, H. Jasmine Chao
Accepted Manuscripts
DOI: 10.4209/aaqr.2018.01.0028
PDF
;