Abstract
This study was conducted to elucidate the effects of sampling methods, types of vehicle, driving conditions and ambient air conditions on the concentration of PCDFs, PCDFs and coplanar-PCBs (dioxins) in vehicle exhaust gas. The sampling methods of exhaust gas affected the observed concentration of dioxins in vehicle exhaust. The cocentration of dioxins in diesel exhaust was almost same to that in gasoline exhaust and the concentration of dioxins in settled velocity was less than mode-driving conditions. It was speculated that the ambient air conditions might influence on the concentration of dioxins in the exhaust.
The calculated dioxins inventory from vehicles under this study is relatively less than the inventory of dioxins published by environment agency government of Japan.
