本研究旨在實際瞭解街道塵坋土特性,中部、雲嘉南與高屏空品區為台灣地區PSI不良率較高的空品區,且懸浮微粒不良比例也明顯偏高,而懸浮微粒的最主要排放源為車行揚塵。其主要是以中部、雲嘉南與高屏空品區所在的八個縣市各選定4、5條代表性道路進行街道塵坋土採樣。街道塵坋土採樣依照U. S. EPA AP-42 鋪面道路街塵之採樣方法執行,再依ASTM-C136標準篩分法得到各粒徑之塵坋土量,由討論街道塵坋土與影響因子相關性,並探討坋土荷重削減對周界懸浮微粒濃度之影響,最後針對街道塵坋土防制措施提出建議。 經研究結果可以得知臺灣中南部八個縣市之塵土荷重平均值為2.080 g/m2,坋土荷重平均值為0.606 g/m2 ;其中塵坋土荷重值以南投縣為最高,嘉義縣最低;在掃街頻率每周3次的情況下坋土削減量大約介於0.038至0.540 g/m2,而坋土負荷較高之區域,街道周界PM10濃度之削減效率可達7%以上,進而推估PM2.5濃度,如以空氣中PM2.5濃度為15μg/m3,以坋土荷重分級標準等級B級道路為例,每周掃街3次的情況下,對於空品區PM2.5濃度削減效率為0.012 %,其結果顯示掃街作業只能減少空品區中PM2.5濃度0.0018 μg/m3。
The dissertation presents the characteristic of street dust in Cental and Southern Taiwan Air Quality Area,which are the worst PSI in Taiwan. Collecting eight county street dust samples in Cental and Southern Taiwan, and selecting 37 roads.The sample collection method for the street dust according to U. S. EPA AP-42 procedures, which are based on a review of American Society for Testing and Materials (ASTM) methods C-136. It was found that the amount of street dust loading is 2.080 g/m2, the amount of street slit loading is 0.606 g/m2. Street dust loading and street slit loading had the highest value in Nantou County, lowest value in Chiayi County. In the case of street sweeping frequency of three times a week, the amount of street slit loading reduced between about 0.038 to 0.540 g/m2 and street ambient PM10 concentration reduction efficiency can up to 7%. Further to estimate the PM2.5 concentration. As the PM2.5 concentration in the air was 15μg/m3 and roads silt load grading standards Class B. In the case of street sweeping frequency of three times a week, the air quality area PM2.5 concentration reduction efficiency was 0.012 %. The results showed that street sweeping only reduced air quality area PM2.5 concentrations 0.0018 μg / m3