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Cancer risk from incidental ingestion exposures to PAHs associated with coal-tar-sealed pavement

Environmental Science and Technology

By:
, , and
DOI: 10.1021/es303371t

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Abstract

Recent (2009-10) studies documented significantly higher concentrations of polycyclic aromatic hydrocarbons (PAHs) in settled house dust in living spaces and soil adjacent to parking lots sealed with coal-tar-based products. To date, no studies have examined the potential human health effects of PAHs from these products in dust and soil. Here we present the results of an analysis of potential cancer risk associated with incidental ingestion exposures to PAHs in settings near coal-tar-sealed pavement. Exposures to benzo[a]pyrene equivalents were characterized across five scenarios. The central tendency estimate of excess cancer risk resulting from lifetime exposures to soil and dust from nondietary ingestion in these settings exceeded 1 × 10–4, as determined using deterministic and probabilistic methods. Soil was the primary driver of risk, but according to probabilistic calculations, reasonable maximum exposure to affected house dust in the first 6 years of life was sufficient to generate an estimated excess lifetime cancer risk of 6 × 10–5. Our results indicate that the presence of coal-tar-based pavement sealants is associated with significant increases in estimated excess lifetime cancer risk for nearby residents. Much of this calculated excess risk arises from exposures to PAHs in early childhood (i.e., 0–6 years of age).

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Cancer risk from incidental ingestion exposures to PAHs associated with coal-tar-sealed pavement
Series title:
Environmental Science and Technology
DOI:
10.1021/es303371t
Volume
47
Issue:
2
Year Published:
2012
Language:
English
Publisher:
American Chemical Society
Publisher location:
Washington, D.C.
Contributing office(s):
Texas Water Science Center
Description:
9 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Environmental Science and Technology
First page:
1101
Last page:
1109