For diesel vehicle pollution control, the Department of Environmental Protection of the Hsinchu County Government regularly entrusts "The Plan of Diesel-fueled Vehicle Smoke Emission Detection on Dynamometer" to improve the air quality in Hsinchu County. Also, give the county people a clean and fresh living environment. The government expects to improve the air quality in Hsinchu County through random inspection, control, and adjustment to achieve the effect of pollution reduction and environmental protection. This project focuses on the checking of diesel-fueled vehicles driving in Hsinchu County. The public will inform the diesel vehicles operating in the area to arrive at the station for inspection by visual identification of emissions. In addition, they use the license plate recognition system to check the pollution emission of diesel vehicles driving in the air quality maintenance zone and the autonomous management area within the jurisdiction.
During the implementation period, the plan has used dynamometer detection (automatic arrival inspection, autonomous management, notification arrival inspection, etc.) and roadside inspection to understand the high-polluting vehicle population. According to statistical analysis, the test failure rate for roadside inspection was relatively high. After screening 111 vehicles, the test failure rate was 46.8%. There are more cases of personal-use heavy trucks with a high test failure rate that should continue to be tracked and inspected. Compared with dynamometer testing (a total of 2,760 vehicles' arrival inspection), the failure test rate was 4.2 %, and the test rejection rate was 3.9 %. Vehicles with a vehicle age of 22–24 years and vehicles with a displacement of 7000-8000 c.c. are the groups with a higher failure rate. The failure test rate of the vehicle types is higher for commercial buses. Therefore, it is necessary to continue to send automatic arrival notices for vehicles with a high test failure rate to keep track of pollution emissions.
Based on the analysis of various inspection projects, this plan has signed the "green fleet" of 75 enterprises. There are 2163 environmentally friendly diesel-fueled vehicles in total, and the overall value of opacity monitors of the environmental protection team is only 0.15 m-1. Compared with other inspected cars, the pollution emission is the lowest. A total of 850 autonomous management operators have signed that manage 4744 diesel-fueled automobiles and have issued 3054 autonomous management seals. Compared with those before and after autonomous management, the value of the opacity monitoring and the pollution improvement rate of these vehicles reached 41.0 %. It shows that promoting a green fleet and autonomous management can effectively reduce vehicle pollution emissions.
There were 23,409 cars with visual identification of emission and 164 visual identification of emission notices. There were 24 joint inspections in Hsinchu City, Hsinchu County, and Miaoli County. We have used the license plate recognition system 191,954 times and have sent 3,834 automatic arrival inspection notices. Besides, they continue to control the autonomous management areas to promote the acceptance rate of the science-based industrial park to 63.7% and Hsinchu Industrial Park to 54.0%. In response to the control results of the air quality maintenance zone, we sent out 1,031 automatic inspection notices and publicity sheets for 1,031 vehicles and reported 194 illegal ones. The control rate of the control objects has increased by 1.7 times, and pollutants such as NOX, PM2.5, and VOCs all have a significant downward trend after control. Besides, we have completed the designation of the air quality maintenance zone in the west area of Hsinchu Industrial Park. And we plan to operate to control the air quality maintenance zone in the west area of Hsinchu Industrial Park from January 1, 2023.
Pollution improvement of large fleets is through sending publicity sheets, visiting operators, telephone visits, and questionnaire publicity. That prompted the scrap of 421 large diesel-fueled vehicles,156 vehicles to apply for repair subsidies, and six to apply for smoke filter assistance installation. In addition, 98.7% of the large fleets with more than ten cars in the jurisdiction have completed the signing of autonomous management. 13 operators have joined CSR green fleet.
As for the innovative and advanced approach, we have set up to promote self-management combined with a urea water supply plan to reduce the situation by the public for modification of urea selective catalytic reduction (SCR). And increase the autonomous management signing rate by 3.8%, and complete 393 SCR system inspections. In addition, the county set up a set of fixed and mobile sound and cameras of law enforcement equipment to cooperate with fixed-point and non-fixed-point motor vehicle noise inspections. During the planning period, we reported 285 motor vehicles with excessive noise under the law. The county's unit equipment (2 sets) technology law enforcement reporting rate ranks fourth in the country.
The results of the implementation of this plan include the improvement of pollution of vehicles that failed to pass the inspection of various inspection projects, the pre-adjustment of cars with integrated maintenance and checking, and the guidance of elimination of mobiles. This project estimates the improvement effect of pollutant discharge reduction, which can reduce 51.05 tons/year of particulate pollutants.
