The objects of this project are dioxin and heavy metal, the scope of work for this project includes: 1) to update and establish the emission inventory of dioxin and heavy metal; 2) to execute the emission investigation from the stationary sources and environmental dioxin monitoring; 3) to assist in drafting the heavy metal emission standard and to review and amend the existing emission standard of dioxin; 4) to provide the technique and administrative assistant for the EPA . The achievements of this project are described as below: As dioxin parts, estimation of the total dioxin emission in Taiwan area is 101.9 g-TEQ in 2005. And less 42.1 g-TEQ than 2004( 29% less than 2004). The largest pollution source is still the Taiwan Union Steel. The”Dioxin control and emission standard of the ashes thermal refining facility for steel industry” was stipulated on October 12, 2006. According to all of the emission test data in 2006, it was showed that the dioxin emission from the Taiwan Union Steel can meet the standard. It is expected that the total dioxin emission will be lower in the future. There were a total of 62 sampling sites of the dioxin air monitoring and the executed sampling twice during this project (the monitoring was performed from Aug. 2006 to Oct. 2006 and from Dec. 2006 to Jan. 2007, respectively) it were showed that the overall average dioxin air concentration 0.032 pg I-TEQ/m3 and 0.043 pg I-TEQ/m3, respectively. (The national part monitoring stations were not included.) The Central air quality control area and the Kao-ping air quality control areas which were highly dioxin concentration. The national park area dioxin concentration was lowest. Due to the total dioxin emission was reduced yearly; the dioxin air concentration in 2006 was lower than 2002 and 2003(the average dioxin air concentration 0.089 pg I-TEQ/m3). There are a total of five points of pollution sources testing conducted in this project, which include coal electric utility, electric arc furnace, incinerator and Taiwan Union Steel. It was found that all of the emission from the pollution sources can meet the dioxin standard. As the heavy metal parts, estimation of the total lead emission in Taiwan area is 24.3 metric tons in 2005. The largest lead emission source is the secondary lead smelters which is 8.93 metric tons in 2005. The other major emission sources are the coal electric utilities, coal industry boilers, electric arc furnace and cement kiln. Estimation of the total cadmium emission in Taiwan area is 0.893 metric tons in 2005. The major emission sources are still the coal electric utilities, coal industry boilers, electric arc furnace and cement kiln. Estimation of the total mercury emission in Taiwan area is 1.36 metric tons in 2005. The major emission sources are cement kiln and municipal waste incinerators. The other major sources are electric arc furnace and coal electric utilities. Estimation of the total mercury emission in Taiwan area is 1.36 metric tons in 2005. The major emission sources are cement kiln and municipal waste incinerators. The other major sources are electric arc furnace and coal electric utilities. Estimation of the total arsenic emission in Taiwan area is 5.64 metric tons in 2005. The major emission sources are coal electric utilities, coal industry boilers, and cement kiln. Based on risk assessment and technology feasibility, the draft” Arsenic control and emission standard of the semiconductor manufacturing industry” was prepared. It was recommended that the arsenic emission standard was 0.0015 mg/Nm3. The heavy metal emission standard of the stationary sources was reviewed and the recommended revised standards are prepared in this project. The recommendations are: the lead emission standard is 1.5 mg/Nm3，the cadmium emission standard is 0.6 mg/Nm3 , the mercury emission standard is 1.6mg/Nm3 and the arsenic emission standard is 0.1 mg/Nm3.

Dioxin, Heavy metal, Environmental Monitoring