大氣懸浮微粒中含碳成分的來源極為複雜，以細粒徑微粒來說，大部分是由燃燒過程所產生的，如柴油車、汽機車等交通工具、燃料油、燃料煤的燃燒過程所排放，除此之外，大氣中經由光化學反應產生的二次衍生性氣膠，亦為懸浮微粒中含碳成分的主要來源。
本研究針對大氣中懸浮微粒，逸散性污染源以及移動性污染源含碳成分的排放特性，進行其中不同粒徑懸浮微粒含碳成分之特性分析，期能利用大氣懸浮微粒其OC與EC最小的比值，推算出二次衍生性氣膠的生成比例。另外，再配合CMB受體模式污染源貢獻量結果，和排放源資料庫對於懸浮微粒之貢獻量，分別推算出代表原生性污染源的OC/EC比值，在與大氣環境中的最小比例值做比較。
懸浮微粒量測結果顯示，PM2.5的濃度為11.8～105μg/m3之間，PM10的濃度為30.7～110μg/m3之間。懸浮微粒的濃度，南部地區因受工業區的影響比中部地區要高；而夏季的濃度比冬季低，則是台灣地區懸浮微粒季節變化的趨勢。含碳成分部分，有機碳（OC）與元素碳（EC）比例的日、夜變化趨勢為日間大於夜間，其中高峰值則出現在中午12點左右。
移動性污染源的特性，機車隧道的採樣結果較接近於二行程機車高轉數試驗的結果，其OC/EC的比值PM2.5為5.4、PM10為6.2，而汽車隧道的採樣結果則與直接收集柴油車尾氣的試驗結果不同，分別是隧道的0.41、0.57，尾氣排放的0.72、1.05。逸散性污染源中PM2.5、PM10的OC/EC比例分別，農田平均為1.71、3.16；揚塵平均為4.60、3.40；營建工地平均為0.65、1.64。
利用大氣懸浮微粒OC/EC的最小比值所推算出衍生性有機碳，在PM2.5微粒中的濃度介於8.87～23.7μg/m3之間，佔總有機碳的比例介於32％～90％之間，PM10微粒當中的濃度介於5.54～22.1μg/m3之間，佔總有機碳的比例介於24％～61％之間。而此比值比利用污染源貢獻量所計算出的比例小，此結果會造成衍生性氣膠高估的現象。

Carbonaecous species in ambient particle are emitted from varies sources , for fine particle , most of them are produced from combustion processes , like diesel trucks . gasoline cars . motorcycle . and the combustion processes of fuel and coal . In addition , the secondary organic aerosol produced by photochemical reaction is also the major part of carbonaceous species.
This research discuss the carbonaceous species of ambient particle , fugitive sources and mobile sources. Then , estimate the contribution of of secondary organic carbon by the minimum OC/EC ratio of ambient particle. In addition , we use the result of CMB recept model and emission inventory to estimate the OC/EC ratio of primary sources.
The PM2.5 concentration in this research ranged from about 11.8 to 105 μg/m3 and the PM10 ranged about 30.7 to 110 μg/m3 .The particle concentration in southern Taiwan is higher than in the middle of Taiwan and summer lower than winter.
For mobile sources , the result of motorcycle channel sampling is close to the result of two stroke motorcycle in high r.p.m. condition , and the OC/EC ratio of PM2.5 and PM10 are 5.4 and 6.2 . The result of car channel sampling is different to the result of diesel truck tail pip. The OC/EC ratio of car channel sampling is 0.41 , 0.57 and 0.72 , 1.05 of tail pip .The OC/EC ratio of fugitive sources of PM2.5 and PM10 are : farm soil (1.71 , 3.16) , resuspended dust (4.6 , 3.4) and construction work place (0.65 , 1.64).
The concentration of secondary organic carbon calculated by the minimum OC/EC ratio , for PM2.5 , the concentration ranged 8.87 to 23.7μg/m3 and contribute the total organic carbon from 32% to 90% : ranged 5.54 to 22.1μg/m3 and contribute from 24% to 61% for PM10. But the minimum OC/EC ratio of ambient particle is smaller than the calculated ratio , though the concentration would be over estimated.

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