To reduce Yunlin County’s diesel vehicle smoke emission influencing both air quality and citizens’ living standard, Yunlin County Environmental Protection Bureau continued promoting “2009 Diesel Vehicle Dynamometer Smoke Emission and Petrol Quality Monitoring and Testing Plan,” implementing diesel vehicles smoke emission inspection as well as petrol quality monitoring so as to maintain the air quality at Yunlin County. The project, “2009 Diesel Vehicle Dynamometer Smoke Emission and Petrol Quality Monitoring and Testing Plan,” held for one year, beginning from April 3rd, 2009 to March, 31st, 2010. With all the tasks reaching exceeding 100% of completion, the figures presenting in the final report conformed to those stipulating in the contract. This project mainly made use of visual inspection of exhaust fume, roadside spot inspection, and station inspection as methods to ask the drivers of the high-pollutant emitting vehicles for inspection. Furthermore, the petrol quality monitoring and testing to the diesel vehicles that passed the County as well as the patrol and checks toward oil businesses, etc were adopted to block the numbers of high-pollutant emitting vehicles from emitting fumes and from using illegal petrol. Due to the execution of the above inspection, 5.85 tons of the air pollutant, TSP has been reduced. In addition, in 2010 to improve freight forwarders’ independent management, we pioneer both in the recall of highly pollutant vehicles for inspection and in proposing the formation of Be GREEN motorcade. Effectively, the two programs succeeded in the recall of over 90 percent of the highly pollutant vehicles in B degree. Also, eleven BE GREEN motorcades have come to the inspection voluntarily, 90 percent of which reached A degree. The effect of the two programs is noteworthy. All tasks contained in “2009 Diesel Vehicle Dynamometer Smoke Emission and Petrol Quality Monitoring and Testing Plan” have been completed on time. The results of the project were analyzed and compiled as references for 2010 diesel vehicles pollution control projects in Yunlin County Environmental Protection Bureau.