In Taiwan most cities take diesel cars for the key public transportation tool besides Taipei, which has MRT. Because of the fast business of our country, motors become more and more quickly, and it becomes the major moving air pollution source. In order to understand the using cars’ smoke emission condition and promote that condition of stopping black smoke emission. This project uses the facilities of power gauge smoke emission inspection to do the test of the high amount smoke emission to reduce the air pollution in Chiayi. In the part of analysing the oil using by diesel cars, this year we take 125 oil samples to do analysis of the amount of sulfur; includes 106 oil samples from blocking on the road, but has 21 unqualified after examining. Otherwise, we get 19 oil models from inspection station, and have 4 unqualified. The rate of unqualified is 20%. Depend on the power gauge smoke emission inspection analyse, every type of cars’ power are distributed on 30~50%. And this result of statistics tells us that it has great influence for power, which follow the driver’s habit, maintenance condition in heavy cars. Compare the car to test in the inspection station and the oil models from blocking cars on the road, their rate of unqualified are close. But in the sulfur of these two, the oil sample from blocking on the road is average three more than the inspection station’s cars. So we guess maybe the drivers use the illegal diesel generally, they change to use qualified diesel before going to the station do the test.

Chiayi city,air quality,diesel cars