| Summary: | 碩士 === 弘光科技大學 === 環境工程研究所 === 103 === This study focuses on the collection of ambient air particulates as pollutants at sampling sites in Longjing during Oct. 2014 ~ Mar. 2015, and focuses on the concentrations of metallic elements and dry deposition, determined using PS-1 (TSP) and a dry deposition plate. In this study Lung Ching Elementary School (LCHES) has the nearest distances to the Taichung Thermal Power Plant (TTPP) and Taichung Harbor Kwan-Lien Park (THKLP). In addition, Chung-Hsing bridge is the main road which connect with THKLP and Taichung downtown area. However, Long Cyuan Elementary School (LCYES) was the sampling site with low developed area. Thus, it has the lowest pollutants concentrations when compared with LCHES and Long Shan Primary School (LSPS) sampling sites. In addition, this studied also find the sources of pollutants by back trajectory analysis, and the result indicate that the major pollutants sources were come from China especially in January. These pollutants will come to Taiwan along with dust storm accompany with exhausted gas from TTPP and THKLP. And the highest particulates bound mercury was occurred in January. In addition, China is the largest atmospheric mercury (Hg) emitter in the world. Thus, the above factor along with the dust storm prevailing spring season will results in the high particulates bound mercury Hg(p) concentrations measured in the spring season of Taiwan. Moreover, PCA results also show that the factor loading values > 0.7 frequency for metallic elements Mn, Fe, Zn and Hg(p) were greater the other metallic elements. Thus, we conclude that the major pollutants were mainly from steel factory and vehicles emissions at THKLP and TTPP sampling site. It has significant health impacts at the Longjing sampling site for this study. Moreover, the average metallic elements concentrations at Longjing (Taichung, central Taiwan) were improved when compared with those of the previous year metallic elements concentrations in the same area.
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