從工業革命開始後，全球CO2含量逐年且持續升高，特別是都市整體的耗能導致產生極高的CO2排放量。本研究分析過去的相關研究後，以臺中都會區為研究對象，區分為建築、交通及綠化碳匯等多尺度的評估項目，並經統計數值資料及都市空間資訊後，建立得到都市整體碳收支地圖。

本研究首先於交通尺度方面，將重要道路交叉口其整天交通量，進行統計解析後，得到主要道路路口於24小時內該路口總小客車當量之推測公式。再以16個街廓之各尖峰交通量調查資料，求得全年交通量所產生總二氧化碳排放量。建築尺度方面，以十年的建築許可相關審議的資料，彙整與應用細部資料加以修正後，再依各土地使用分區與其耗能密度關係，進行完整的耗能解析。

本研究結果發現，都市年平均碳排放量占比分別為建築碳排放量為67.6%、交通碳排放量為30.5%及碳匯吸收量 1.9%。本研究採用多變數複迴歸模型統計，其建築物每一總樓地板面積，產生每年於建築使用階段總碳排放量為16.51 tCO2/㎡·yr。本研究再深入整理市政府未來的行政執行政策，以務實地設定三種不同執行階段的未來情境模擬後，以高解析度網格呈現出多尺度的碳收支成果外，更有助於政府機關訂定後續優先減碳策略方式及都市碳中和之政策。

This research reviewed the relevant literature, then adopted the Taichung metropolitan area as the research target and assessed carbon emissions with respect to buildings, traffic, and carbon sinks. The total CO2 emissions generated by the traffic volume in the entire year is calculated according to the investigation data of peak traffic hours within 16 blocks and the influential factors of the development scale of 95 buildings are counted.

This research found that there is a passenger car unit of 4.72 generated in each square meter of land in the urban block every day, 0.99 in each square meter of floor area in the building and the average annual total CO2 emissions generated by the traffic of each square meter of floor area in the building is 12.97 kgCO2/yr. The results of this research indicated that the annual average urban carbon emissions consist of 67.6% building carbon emissions, 30.5% traffic carbon emissions, and 1.9% carbon sink absorption. In this research, a multiple regression model was used to calculate the floor area of each building. This research also determined that densely populated areas emitted higher levels of carbon than less populated areas. For every square meter of total floor area, 16.51 tCO2/m2·yr of carbon were emitted from buildings every year. Recommended policies for the city government to implement in the future were organized and used to establish three simulation scenarios of the various implementation stages.

In addition, the high-resolution grid was used to present the multi-scale carbon budget results, which helps government agencies to formulate follow-up priority carbon reduction strategies and urban carbon neutral policies.

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