| Summary: | 碩士 === 大漢技術學院 === 土木工程與環境資源管理研究所 === 106 === This study was conducted between year 2013 to 2016, through analyzing the mass concentration of PM10 and PM2.5 from the vent of Hualien Port gravel truck vehicular underpass. At the same time, the composition of traffic vehicles through the underpass was calculated, in order to determine the characteristics of PM10 and PM2.5 emissions from mobile sources. According to the results, the PM10 hourly average values varied from 27 to 455μg/m3, whereas PM2.5 varied from 22 to 310μg/m3.The correlation coefficient(R) between PM2.5 mass concentration and EC reaches 0.98~0.99, while PM10 reaches 0.98; The R values of Ca2+ varied between 0.83~0.94. The R values that consisted from the total of diesel vehicles(includes large passenger vehicles, truck, gravel truck and concrete transport truck) heading north within the underpass and PM2.5 mass concentration varied between 0.79~0.87; The R values of EC concentration of PM2.5 are between 0.79~0.87. The R values consisted from the total of large diesel vehicles and PM10 concentration varied between 0.85~0.89; The R values of EC concentration within PM10 are between 0.82~0.89; The R values of Ca2+ concentration within PM10 are between 0.77~0.87.As a result of EC being an important characteristic component in diesel vehicle emissions, whereas Ca2+ being the distinctive component of road dust, this study has showed that PM2.5 in the underpass mainly comes from diesel vehicle emissions; Whereas PM10 comes from diesel vehicle emissions and road dust due to speed driving.
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