The study of human exposure to environmental PAH
pollution sources identified the age-specific potential
cancer risks. Recognition of the importance of inhalation
cancer slope factor and particle-bound PAH-to-skin
adherence factor in PAH exposure led to the efforts to
estimate the significance of inhalation and dermal
ILCRs. Sensitivity analysis indicates that to increase
the accuracy of the results efforts should focus on a
better definition of probability distributions for inhalation
cancer slope factor and particle-bound PAH-to-skin
adherence factor. Given the scarcity of data, most of the
probability distributions were based on US EPA data,
and this may be a limit to the validity of the case
presented.