For the purpose of this project, emission smoke test was performed on diesel vehicles based on the “method and procedure for the emission smoke test on diesel-fueled vehicles.” During the period from March 1 to December 31 2018, 2,790 vehicles were tested on dynamometer and 2.0% of the tested vehicles were rejected for insufficient specific power. 5.7% of the tested vehicles reported in for testing on the notification of the city Hall. 3.5% and 88.8% of the tested vehicles came from other counties/cities and were brought to inspection stations by the owners, respectively. With those of insufficient specific power rejected from testing, 2,735 vehicles were tested, including 220 tested at no load and 2,515 tested at full load. 260 vehicles failed the test. A total of 2,62 vehicles were pulled over for the opacity test from March 1 to December 31 2018. 753 failed the opacity test and the owners of 577 of them chose the pollution test and 165 failed the test. The final ruling was that 341 vehicle failed all tests for a failure rate of 13.1%.

Particulate pollutants