PT01 Risk Management
Exhibit Hall
8:00 AM - Tuesday
(PT01) Risk assessment of exposure to dichloromethane in Japan including site-specific assessment.
Inoue, K.1, Higashino, H.1, Yoshikado, H.1, Nakanishi, J.1, 1 National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan
ABSTRACT- Dichloromethane has been widely used in the industries and has been released into the air in large quantities in Japan. We have evaluated the Japanese health risk of exposure to dichloromethane by using the regional distribution of ambient concentrations, which are calculated with the horizontal resolution of 5 km by the AIST-ADMER (AIST's Atmospheric Dispersion Model for Exposure and Risk assessment), and considering indoor concentrations. This work has been improved from the previous one, which was presented in the last congress, in that 1) site-specific assessment was also carried out using METI-LIS (METI's Low-rise Industrial Source dispersion model) with the horizontal resolution of 100 m in the selected regions near the large point sources, 2) the risk assessment was conducted throughout Japan, 3) cancer risk and non-cancer risk was separately evaluated while only the guide line value was used in the previous work. Results show 1) even in the selected regions near the large point sources, there are no people whose life time cancer risk is 10-5 or higher, 2) lifetime cancer cases are no more than one throughout Japan, 3) there are 21,000 people who are possible to suffer from the non-cancer adverse health effect (liver histopathology) throughout Japan, and 4) health risk is more contributed by emission from indoors than one from outdoors even in the selected regions near the large point sources.
Key words: risk assessment, dichloromethane, dispersion model