10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
Abstract View
Impacts of Hazardous Metals and PAHs in the Ambient Air from Local and Regional Sources and Exceeded Cancer Risks in Taipei city
CHIN-YU HSU, Shih-Min Wang, Tzu-Ting Yang, Jyh-Larng Chen, Hung-Che Chiang, Yuh-Shen Wu, Yu-Cheng Chen, National Health Research Institutes, Taiwan
Abstract Number: 647 Working Group: Source Apportionment
Abstract This study assessed the influence of health risks for ambient PM2.5-10- and PM2.5-bound metals/PAHs in terms of the long-range transport in New Taipei City. Particle measurements were conducted during winter and summer in 2014. Twenty-two trace metals and PAHs in PM10 and PM2.5 were analyzed using ICP-MS and GC-MS. Trajectory statistical methods combined with potential source contribution function (PSCF) were utilized to distinguish local and long–range transport of PM concentrations. The positive matrix fraction (PMF) were applied to quantify potential sources of toxic metals/PAHs. The annual mean concentration of PM2.5 was 22.69±9.53 μgm-3, while PM2.5-10 was 19.24±11.08 μgm-3. The level of excess cancer risks for PM2.5-bound metals (6.23×10-5) was higher than those for PM2.5-10-bound metals (1.41×10-5). PM2.5-bounded BaPeq concentrations and cancer risk were respective 0.64±0.34 ngm-3 and 5.59×10-5. A seasonal variation for PMs and most metals/PAHs with a higher level in the winter than the summer were observed. Through a PMF model, the contributors of cancer risk from traffic-related emission (59.75%), coal combustion (20.65%), and re-suspended dust (19.60%) were identified. The enhanced cancer risk due to long-range transport from traffic-related emission, coal combustion, and re-suspended dust are about 4.03%, 9.03%, and 1.48%, respectively.