Abstract
The Intake Fraction (iF) is the ratio of the cumulative mass inhaled by the exposed population to the cumulative emission. It has been proposed as a measure that can facilitate the establishment of the measured and decision making for pollution control, but the iFs for any pollutant have not been estimated in Japan. We estimated the iF for emissions from motor vehicles traveling in each prefecture using ADMER (one of the Gaussian plume and puff formula atmospheric dispersion models called the Atmospheric Dispersion Model for Exposure and Risk Assessment developed by the National Institute of Advanced Industrial Science and Technology (AIST), Japan). The value of iF for benzene and 1,3-butadiene emitted from motor vehicles traveling in each prefecture ranged from 2.7×10-6 to 130×10-6 and from 1.8×10-6 to 84×10-6, respectively. They were higher than the iFs estimated in other countries. Our study also suggested that more sophisticated grids increase the iF values, and considering the diurnal variation in the emission and meteorology will decrease the iF values, then it will be necessary to clarify the effect of the estimation methods on the iF values.
