The mean PCDD/F concentrations in ambient air nearby Keelung, Lize, Gangshan and Kanding municipal solid waste incinerators (MSWIs) are 0.0293, 0.0649, 0.0792 and 0.0630 pg I-TEQ/Nm3, respectively. The mean PCDD/F contents in Ficus leaves nearby these three MSWIs are 1.34, 1.75, 3.91 and 2.07 pg I-TEQ/g, respectively. The mean PCDD/F contents in soil nearby these three MSWIs are 0.875, 0.779, 1.67 and 0.988 pg I-TEQ/g, respectively. By comparing the PCDD/F concentration of maximum ground concentration sampling sites, upwind sampling sites and downwind sampling sites, the distribution of the PCDD/F concentration isopleths in the atmosphere and the result of PCA, the PCDD/F influence from MSWIs on nearby ambient air, vegetation and soil is not obvious, however, some sampling sites which are around by other stationary emission sources are found with elevated PCDD/F level. After four year’s operation, the dioxin level of ambient air, vegetation and soil nearby Gangshan and Kanding MSWI still maintain in the same level. By analyses with the t test, there is no significant difference on the dioxin level after four year’s operation.

incinerator,dioxin,ambient air,vegetation,soil