The Nantou County locates on the eastern site of Taichung city and on the western site of Central Mountain Range. Thus, it is easily to accumulate dioxin in Nantou with the air parcel transferred from western sources. Additionally, two incinerators have already operated in west Taiwan recently, and these also are important dioxins sources. For understanding dioxins characters and sources in the Nantou County, this study analyzes impact range and dioxins characters of near incinerators by measurement and GTx modeling. The dioxins concentrations in Tsautuen, Chushan and Huisun were 0.11, 0.17 and 0.0095 pg I-TEQ/m3, respectively. The characteristic index could be founded that Tsautuen station was not only impacted by incinerators, but also impacted by secondary aluminum plants. For Chushan station, the main sources were incinerators, sinter plants, electric arc furnaces, secondary plants, diesel-fueled vehicles and unleaded gas-fueled vehicles. The model also showed that pollutants were easily transferred into Chushan in north and northeast wind system. Therefore, the north wind system would facilitate the dioxins transporting into Chushan and Shuili, and leaded the dioxins concentrations increasing.

Incinerator ; Dioxins ; GTx