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In this research, we attempt to establish the native method and database to estimate vehicle kilometer traveled (VKT) and emission of mobile source over southern Taiwan. Therefore, estimating schemes of VKT and vehicular emission were modularized with programming language. Mobile emission is the product of emission factor (EF) (R.O.C. EPA, 1999) and vehicle kilometer traveled (VKT). Vehicles were divided into 14 types, which are named as private-passenger car, gasoline-taxi, LPG-taxi, low-duty gasoline truck (LDGT), low-duty diesel truck (LDDT), Taiwan Mobile''s heavy-duty diesel vehicle (HDDV), country-bus, city-bus, public HDDV, touring bus, heavy-duty diesel truck (HDDT), the ally-truck, two-stroke motorcycle and four-stroke motorcycle. Three steps are proposed to estimate vehicular VKT. First, we calculated total VKT of classified motors with fuel consumption and numbers of existed vehicles. Secondly, we suggested reasonable VKT values for various motors by oil types. Finally, mobile emissions at each cell distinct vehicles were achieved by the integration of traffic flow and reasonable VKT values on different roads. Results revealed the dominant contributors of VKT in Southern Taiwan were private-passenger cars (17%) and two-stroke motorcycles (12%). The major contributors of THC emission were private-passenger cars (51%) and two-stroke motorcycles (20%); private-passenger cars (62%) and two-stroke motorcycles (12%) for CO emission; HDDTs (40%) and private-passenger cars (29%) for NOx emission. The analysis of spatial patterns presented that Kaohsiung city and Tainan city were the main polluted areas for THC、CO and NOx emission over Southern Taiwan.
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