The pollution of PM2.5 particulate matters has caught much of the public attention in terms of poor air quality. According to the data of Environmental Protection Administration, Executive Yuan for the influence of PM2.5 level on the pollution sources in Taiwan, mobile pollution sources account for 30~70% of the total PM2.5 quantity. Further investigation reveals that diesel-fueled trucks contribute the most at 11.2~16.8%. Chiayi City is a small city where most of the population concentrates at downtown. The majority of pollutants produced by diesel-fueled vehicles is PM2.5 particles, which is also one of the main causes of deteriorated air quality. In the context of establishing urban Chiayi City as an air quality maintenance zone, this plan was developed to stay on top of diesel-fueled vehicles running within Chiayi City by installing license plate ID system as major access portals to specified areas. Vehicle inspection notices were sent to the owners of vehicles identified with failed inspection records as an encouragement for the owners to develop a good habit of keeping their vehicles well maintained and inspected for emission. Before the air quality maintenance zone is officially on line, several smaller air quality zones will be established for demonstration. Initially, inspection notices are issued before the control intensity is increased. The overall purpose is to reduce the pollution generated by diesel-fueled vehicles in urban areas, improve the air quality of Chiayi City and, ultimately, establish successfully the air quality maintenance zone at downtown Chiayi City. The plan started from Sep 25th 2018 to Dec 15th 2018, with the following results: 1.12 license plate ID systems were installed along Sections 1 through 4, Shixian Road and are operating as expected. 2.The receiving and processing center was established for the license plate ID systems installed. 3.5,180 vehicles reported for inspection in response to the notices issued after license plates were identified. 4.The brochure of air quality maintenance zone was designed and 20,000 copies were printed. 5.The downtown transportation hub and Lantan Scenic Area were selected for the demonstrational air quality maintenance zones as a part of the preliminary plan and signs and bulletins were erected. 6.An evaluation plan was proposed covering the control and analysis measures for Chiayi City, the evaluation of those who impacted by the establishment of the air quality maintenance zone and the future control and auditing measures for diesel-fueled vehicles in Chiayi City. 7.3 news articles were produced for publicity. 8.A technology transfer workshop was organized and completed.

Diesel vehicles, Air quality maintenance zone