Emissions from motor vehicles contribute a significant portion to the air pollutant emission inventory in Taiwan since 1990’s. Taiwan Environmental Protection Administration (TEPA) has adopted several control strategies to reduce emission from mobile sources, both for new and in-use vehicles, and get clear progress in late 1990’s. Due to the rapid growth of in-use vehicles, TEPA proposes more control measures to reduce emission from motorcycles, gasoline vehicles, and diesel engines. Because of the most frequent occurrence of episode days in southern Taiwan air basin, these measures are developed and expected to be implemented in this air basin in coming future. This paper discusses the candidate control measures for in-use gasoline vehicles. There are five measures designed for in-use gasoline vehicles, which include passenger car, taxi, and light-duty gasoline truck. Control measures for these vehicles have been evaluated based on emission reduction potential and cost-effectiveness. The data indicated that the enhanced smoke check program shows a moderate equivalent emission abatement (EEA) potential and poor cost-effectiveness. Incentive program has high EEA potential and good cost-effectiveness. The remote sensing program also shows good EEA potential and moderate cost-effectiveness. The other two measures have rare EEA potential and poor cost-effectiveness.
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