The scope of this project includes: 1) Monitoring for the stationary emission and the ambient environment; 2) Establishing and updating of the emission inventory; 3) Assisting the control, reduction and emergency response of dioxins and heavy metal emission. 1) Monitoring for the stationary emission and the ambient environment The ambient dioxin monitoring is targeted on the general monitoring stations. 22 monitoring stations were selected(1 for each province in Taiwan) in this research. 4 times of monitoring were conducted each station separately in February, May, August and October in 2019. The monitored ambient air average dioxin concentration in 2019 is 0.021 pg I-TEQ/m3. The annual average concentration is lower than that in the last year. The monitored concentration of dioxin in February 2019 was 0.030 pg I-TEQ/m³ (0.025 pg WHO₂₀₀₅DF-TEQ/m³) and polychlorinated biphenyls (PCBs) concentration was 0.0028 pg WHO₂₀₀₅DF-TEQ/m³, the concentration of dioxin in May was 0.020 pg I-TEQ/m³ (0.017 pg WHO₂₀₀₅DF-TEQ/m³) and PCBs concentration was 0.0024 pg WHO₂₀₀₅DF-TEQ/m³, the concentration of dioxin in August was 0.014 pg I-TEQ/m³ (0.012 pg WHO₂₀₀₅DF-TEQ/m³) and PCBs concentration was 0.0019 pg WHO₂₀₀₅DF-TEQ/m³, in October was 0.021 pg I-TEQ/m³ (0.018 pg WHO₂₀₀₅DF-TEQ/m³) and PCBs concentration was 0.0022 pg WHO₂₀₀₅DF-TEQ/m³. The annual concentration of dioxin and PCBs was lower than the average annual value over the years. The ambient heavy metal monitoring results showed that the average concentrations of arsenic, cadmium, manganese, nickel, lead, vanadium and mercury are mostly under the ambient air quality standards published by EU and WHO. The monitoring results showed that metal elements related to crust and dust have a significantly higher concentration compared with other metal elements. Also, the metal elements related to traffic had a wide range of concentration in the selected 17 monitoring sites. These trends indicated that traffic and dust are the major heavy metal sources. In order to better understand the chemical composition of stationary source emission, a series of emission monitoring were conducted: dioxin emission monitoring for Xindian incinerator, Sambun biomass wood waste boiler and Yilan crematorium; heavy metal emission monitoring for Dalin coal fired power plants and cement klins of Taiwan Cement Corporation and Asia Cement Corporation.Most of the emission level from monitored emission sources are lower than the Environmental Protection Administration(Taiwan) regulations. These results can be ultilized for estimating dioxin and heavy metals emission amount. 2) Establishing and updating of the emission inventory The total dioxin emission quantity in Taiwan is estimated to be 51.01 g I-TEQ/year in 2018. As for the heavy metal emissions in 2018, the total lead emission is 32.43 metric tons/year, cadmium emission is 0.87 metric tons/year, mercury emission is 1.61 metric tons/year, and arsenic emission is 3.31 metric tons/year. 3) Control and reduction of dioxins and heavy metal emission This year the emission standards for incinerator and cement kiln were proposed, lowering the particulate matter, nitrogen oxides and other air polutants emission limit. Also, meetings with 11 selected stationary sources were held, to directly assist companies’ emission reduction and understand the difficulties of their emission control.

Dioxin, Heavy Metals, Environmental Monitoring