| 英文摘要 |
The goal of this project is to examine the environmental impacts of pollutants (PM2.5, VOCs, and acidic gas) emitted from heavy industrial areas (Houli, Xitun, and Daya Districts, and the seaport in Taichung City). Three major contents of this project are conducted, as follows. (I) Establish and analyze the environmental background data. (II) Survey the concentration distributions of pollutants in stationary sources, as well as the atmospheric and geosphere environments of Taichung City. (III) Use the CMAQ model to evaluate the contributions of industrial pollutants to Taichung City. In part I, the fingerprint data of 20 emission sources, including 8 stroke stationary sources and 12 fugitive sources, were collected and constructed in this project. A toxicological databank of 131 chemical compounds has already been established. Long-term air quality analysis shows that the concentrations of pollutants in three air monitoring stations (Fengyuan, Shalu, and Xitun) in Taichung City all had a declining trend in the past 10 years. PM2.5 events occurred dominantly on the stagnant weather type in Taichung City during recent years. In part II, the results show that the elevated of PM2.5 levels in autumn and winter are mainly due to the contributions of nitrate and ammonium salts. Trace pollutants (such as metal, PAHs, and dioxin) did not increase proportionally with the increased PM2.5 levels. In general, various metals, such as Cr, As, Ni, Pb, B, Zn, Cu, Cd, Se, and Sn in the air of Taichung City are generally contributed by anthropogenic sources. As(V) is the main specie of total arsenic in the atmosphere, and it is suspected that the higher concentrations of As(V) in autumn and winter originated from the emissions of stationary sources. While the concentrations of atmospheric dioxin in Fengyuan, Tanzi, Shengang, Xitun, and Daya District are higher than that in other areas, the soil in the Houli District has a high concentration of dioxin. Sulfuric acid is the main inorganic acid among the measured acidic gases. The gas concentrations of sulfuric acid are higher at NeiPu Elementary School (Houli District) and Houli Horse Farm (Houli District) in the summer periods, and higher at Xitun Elementary School (Xitun District) and Guo an Elementary School (Xitun District) in the autumn and winter periods. The concentrations of pollutants in the soil are much lower than the regulatory control concentrations of Taiwan, and the seasonal and regional differences are small. A sampling of 173 environmental pollutants in 23 stroke stationary sources, and 6 acidic gases in 17 stroke stationary sources have been completed, and the levels of these pollutants are reported. In part III of CMAQ modeling, the simulation duration is September 2013, where the levels of PM2.5 decreased by 1.2% ~ 5.3%, and the levels of SO2 decreased by 4.7% ~ 9.1% after deducting the major emission sources in Houli, Xitun, and Daya Districts, and the seaport in Taichung City.
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