This paper reports the case study result of human health risk assessment of di-2-ethylhexyl phthalate (DEHP). This assessment is equivalent to Assessment I (MAI) and Assessment II (MA II) in the First-Stage Assessment for Japanese Chemical Substances Control Law (Kashin-ho law). We assessed the health risk by the MA I, and MA II taking the real emission sources into consideration. The results of MAI showed that 11 prefectures had the risk concern in Japan. In the MA II, using 5km
2 mesh model, no prefectures were identified as an area with risk concern. However, two prefectures were identified as a risk concerned area with 1km
2 mesh model, and only one place in each prefecture showed the risk. The maximum estimated human exposure value (0.0368mg/kg/day) was about twice the health hazard assessment value (0.0185mg/kg/day). And, each of the area was very small (1km
2). We concluded that this method is considered to be a candidate of an effective method for Assessment II.
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