Spatial-temporal and cancer risk assessment of selected hazardous air pollutants in Seattle

Wu, C. F. and Liu, L. J. S. and Cullen, A. and Westberg, H. and Williamson, J.. (2010) Spatial-temporal and cancer risk assessment of selected hazardous air pollutants in Seattle. Environment international, 37 (1). pp. 11-17.

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Official URL: http://edoc.unibas.ch/dok/A5843024

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In the Seattle Air Toxics Monitoring Pilot Program, we measured 15 hazardous air pollutants (HAPs) at 6 sites for more than a year between 2000 and 2002. Spatial-temporal variations were evaluated with random-effects models and principal component analyses. The potential health risks were further estimated based on the monitored data, with the incorporation of the bootstrapping technique for the uncertainty analysis. It is found that the temporal variability was generally higher than the spatial variability for most air toxics. The highest temporal variability was observed for tetrachloroethylene (70% temporal vs. 34% spatial variability). Nevertheless, most air toxics still exhibited significant spatial variations, even after accounting for the temporal effects. These results suggest that it would require operating multiple air toxics monitoring sites over a significant period of time with proper monitoring frequency to better evaluate population exposure to HAPs. The median values of the estimated inhalation cancer risks ranged between 4.3x10(-5) and 6.0x10(-5), with the 5th and 95th percentile levels exceeding the 1 in a million level. VOCs as a whole contributed over 80% of the risk among the HAPs measured and arsenic contributed most substantially to the overall risk associated with metals
Faculties and Departments:09 Associated Institutions > Swiss Tropical and Public Health Institute (Swiss TPH) > Former Units within Swiss TPH > Environmental Exposures (Liu)
UniBasel Contributors:Liu, Lee-Jane S.
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:27 Oct 2017 09:13
Deposited On:26 Apr 2013 06:59

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