This project is to schedule at last one year altogether from March 20, 2008 to March 19, 2009, this purpose is to keeping human inspection station (six stations ) and auto inspection station (one station ) run well for maintain the air quality in Taichung. Maintain and correct the work in fixed maintenance which implements the monitoring equipment, maintain the appropriate rate of the instrument and equipment, protect the function of the equipment and lengthen service life. Need to support Environmental Protection Bureau to amount to 64 times monitoring once carrying out the general environment volume of area and the road traffic noise, amount to 8 times monitoring of traffic noise state and plead, amount to 4 times monitoring of the noise along the Taiwan High Speed Rail, amount to 16 times monitoring of the background noise along the Mass Rapid Transit,amount to 8 times of vehicle noise measurement,amount to 5 cases monitoring of mobile amplifier. Depend on the rule should fulfill that adopt and put kind sampling and the work of the maintain equipment, and complete all monitor for the noise monitors with the Environmental Protection Bureau. Human inspection station in air quality, have already finishing 2 times a month of Total suspended particulates sampling , to correct and safeguard with the sampling device, and finishing 1 time a month of dustfall sampling. Auto inspection in air quality, has finished week、month、season periodical maintain in the Wunshan station. Noise monitor have already finished the general area environment and road traffic volume monitored amount 64 times. The traffic noise state and plead have finished 8 times monitoring, distributed mainly place by the road large in flow in the traffic.The noise monitoring of Taiwan High Speed Rail has been finished 4 times . We had performed 8 times including 35 vehicles’ inspection. There were 22 vehicles disqualified. The disqualified rate was 62.9％ and the disqualified vehicles were mostly stock cars. The part of the air quality, the bad rate of air quality of this city has already been lowered to 1.64% of the 2008 by 2.05%of the 2007. There are 6 days have the bad number of air quality, the index pollutant has 5 days for PM10,and 1 day for O3 in the Situn station. There are 6days have the bad number of air quality, the index pollutant has 4 days for PM10, and 2 days for O3 in the Jhonming station, the bad index pollutant of air quality is relatively high in proportion with PM10 this year. In this study in visibility, we investigated the relationships between visibility and air pollutants by analyzing the long term trend and seasonal differences in Taichung urban area. And we further studied in the relation of visibility, air pollutants, aerosol components, and meteorological factors in Taichung city in order to interpret the optimal regressive empirical model. According to the study, we concluded that: (1) the best visibility occurs in July, and the worst occurs in March. Approximately, the visibility is better in summer than in winter. (2) degradation of visibility, rising atmosphere pressure, lowering temperature, lower wind speed, and higher daily concentration of air pollutants occur during high-polluted periods. (3) weekend visibility slightly exceeds that on weekdays in Taichung city, but not considerable despite the t-test. (4) visibility is influenced by meteorological factors such as ambient temperature, atmosphere pressure, and wind speed. Visibility is also influenced by road dust, traffic emissions, photo-oxidation reaction, and industrial oil-burning and coal-fired emissions. (5) PM10 concentrations represent the most significant impact on visibility. (6) average concentrations of PM10 mass in high, medium, and low visibility are 35.1, 61.9, and 110.7 ug/m3 respectively.

air quality, monitoring station, noise, Taiwan High Speed Rail, Mass Rapid Transit , visibility