本研究自民國97 年 7 月及 10 月至民國 98 年 1 月，於台中市中港路 高車流量路口及台中市忠明測站、彰化縣線西測站、南投縣埔里測站、
南投縣竹山測站，利用掃描電移動度分徑器/凝結核計數器(sequential mobility particle sizer, SMPS+C, GRIMM model 5.500 )，進行超細微粒數 量濃度調查，結果顯示上包含有：
一、在交通尖峰時段道路旁測量到的超細微粒粒數濃度平均值(±標 準差)為 24.7(±14.0)×104 cm-3，從不同路段、不分時段來看，
中港路與忠明南路交叉口超細微粒數量濃度(± 標準差)為 16.0(± 6.3) × 104 cm-3、與河南路交叉口為 25.6 (± 13.9) × 104 cm-3、與文心路交叉口為 31.5 (± 13.8) × 104 cm-3以及與工業一 路交叉口為25.1(± 15.7) × 104 cm-3，除忠明南路外其餘三個路 段濃度相當接近。從分析結果可知，超細微粒對空氣中總微 粒粒數濃度有決定性的影響，所占百分比皆在89％以上，且 愈接近排放源其濃度愈高。
二、中部空品區超細微粒平均濃度為 1.75(±1.14) ×104 cm-3，忠明測 站超細微粒數量濃度平均值(±標準差)為 2.49(±1.24) ×104
cm-3、線西測站為1.35(±0.80) ×104 cm-3、竹山測站為1.53(±0.98)
×104 cm-3和埔里測站為 1.53(±0.73) ×104 cm-3，表示不同地區會 因污染源及排放量不同，而造成不同的地區超細微粒數量濃度 值有所差異。在分別與室內及路旁所量測到的濃度值比較，顯 示環境中所採集到的超細微粒數量濃度會低於路旁所量測到 的數量濃度值，但會高於室內環境所量測到的濃度值，與其他 地區研究相近。
三、針對微粒粒徑分佈來說，本研究在路旁所量測到的幾何平均粒 徑為27 nm，中部空品區環境為 50 nm、忠明測站為 43 nm、線 西測站為45 nm、竹山測站為 60 nm，而埔里測站為 58 nm，顯 示距離排放源越近超細微粒粒徑越小。從超細微粒數量濃度佔 總濃度百分比來看，路旁為93％、中部地區為 76％、忠明測站 為與80％、線西測站為 80％；埔里為 70％、竹山測站為 68％，
顯示距離排放源越近所佔比例越高，整體結果反映了超細微粒 存在空氣中之短暫性及高度變異性。
四、排放源部分，整體來說中部空品區超細微粒數量濃度受到CO 及NOX的影響較大；忠明測站超細微粒數量濃度與CO 及 NOX 相關性較高；線西測站與空氣污染物SO2相關性較高；埔里測 站超細微粒數量濃度與CO 及 NOX相關性較高；竹山測站超細 微粒數量濃度與SO2及PM10相關性較高。配合各地區排放源分 析，結果顯示，中部地區超細微粒數量濃度主要受到移動性污 染源的影響較大，在特地的地區及時間，顯示工業燃燒及二次 生成有影響。就各個測站而言，除了線西及竹山測站偶有受到 工業燃燒之外，基本上所有測站主要是受到移動性污染源的影 響。
五、透過因子分析並配合環保署排放源貢獻量分析，結果顯示，中 部空品區及各個測站超細微粒數量濃度以當地排放的移動性污 染源為主，而竹山測站則偶有傳輸而來的工業燃燒排放污染源。
六、從個案分析發現，四個測站在中午偶而會有核化現象的情形發 生，而使超細微粒數量濃度在短時間急遽上升，偶而伴隨著數 小時的微粒成長情形，顯示中部空品區有衍生性微粒的產生，
表示光化學反應在中部空品區在特定時間及地點也是超細微粒
重要來源之一。
5.2、研究限制
本研究針對中部空品區超細微粒數量濃度調查，研究限制上包含有：
一、在量測地點上，中部空品區雖然有 12 個測站，但由於時間有限 儀器不足，採樣上僅選擇 4 個測站進行環境量測。且採樣時間選 擇在空氣污染較嚴重的秋冬季節，並未包含春夏季，可能無法確 實描述中部空品區超細微粒數量濃度整年不同季節消長情形。
二、本研究儀器設備上僅使用一部SMPS+C 進行量測，雖然可以減 少儀器間差異所造成的誤差，但由於無法同時於不同採樣點進行 採樣，因此可能會因不同時間，而有不同的氣象因子差異，對結 果及推論上造成影響。
三、本研究只針對超細微粒數量濃度調查，僅能說明物理特性，雖 然加入環保署空氣污染物數據，及氣象因子做分析，但並沒有化 學分析做輔助，因此判斷上僅能推估，無法確切得知超細微粒主 要污染源。
5.3、研究建議
本研究採樣時間僅有四個月時間，其結果僅能代表秋冬季節之特 性，未能完全了解整年超細微粒數量濃度變化情形，建議未來進行長時 間監測，以建立中部空品區超細微粒數量濃度基本資料。在污染源特性 上，建議加入超細微粒化學分析，利用污染源排放特異性，瞭解主要污 染源及各種排放源之相對貢獻量。從結果得知交通對於超細微粒數量濃 度影響相當大，因此建議未來可加入車流量的記數，了解兩者間的相關 性。
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