This project is executed from March 20, 2009 to March 19, 2010 and was budgeted 7,930 thousand New Taiwan Dollars. It accomplished the all assignments and duties, including the sampling with analysis and maintenance of both human and auto inspection stations in air quality, software and hardware devices updating, electrical signboard installation, visibility investigation, indoor air quality announcement and non-atomic ionized radiation monitoring, that Environmental Protection Bureau (EPB) authorized. For the human inspection stations in air quality, Xin Yi elementary school, Cheng Gong elementary school, Wen Shan elementary school, Bei Shin junior high school, Xi Yuan junior high school and Taiwan Railways terminal were sampling and analysis monthly for dust fall. Besides, The TSP sampling with analysis and maintenance were executed twice a month. The fluid correction of single point and multiple points were executed once a month and once a season separately. For the auto inspection stations, every monitoring items of station operated normally according to the weekly and seasonally maintenance of the project. Therefore, the data availability ratio could be over 85%. In addition, the software and hardware devices were also updating such as data management software, air conditioners, atmospheric pressure meters, railings and ladders. The monitoring data show that the air quality in 2009 was worse than it in 2008. Nevertheless, the disqualified rate of urban air quality in 2009 was 2.70% and the index pollutant was O3 as majority. For Situn station, it has 11 days, 4 days and 7 days for disqualification of air quality, index pollutant PM10 and O3 separately. For Jhonming station, it has 9 days, 3 days and 6 days for disqualification of air quality, index pollutant PM10 and O3 separately. For the Wunshan station, the disqualified rate of urban air quality in 2009 was 2.47% and it has 4 days and 5 days for the index pollutant PM10 and O3 separately. The disqualified rate of counties and cities of air quality in central Taiwan were in turn as Nantou County (3.42%), Taichung City (2.70%) and Changhua County (1.23%). For the non-atomic ionized radiation monitoring, the 10 cases of electromagnetic wave monitoring were accomplished. 6 high frequency cases and 4 low frequency cases of electromagnetic wave were measured to fill the bill of environmental suggestions. For the indoor air quality management, 2 educated announcements and statements have been already held. At the same time, 20 public places also participated in the independent managements of indoor air quality and CO2 investigations. Consequently, the results of CO2 investigation filled the bill of environmental suggestions to Environmental Protection Administration (EPA). The results of indoor air quality show that the disqualified rates of fungi were 60% as the most unqualified item. Nevertheless, the 9 examination items of CO2, CO, HCHO, TVOC, PM10, PM2.5, O3, bacteria and temperatures were fill the bill as 100% qualified rate. Besides, West distric office and Beitun district office were awarded excellent organization of indoor air quality according to indoor air quality judgments. They were also the best demonstrated places for indoor air quality in Taichung city. For the visibility investigation, this project discussed the results of particles monitoring and particles analysis of PM10 and PM2.5 for long term visibility monitoring of Taichung Weather Station of Central Weather Bureau (CWB) and rebuilt the PM10 concentration of Taichung urban area in the last 40 years. Also, it compared to the differences of visibility between Taichung City and previous data of central Taiwan area. Therefore, it built the classified index of visibility for Taichung City. In the event, both the best model of optional scenarios and the cost effective policies of pollutant reducing and control for visibilities upgrading could be built completely. According to the study, we concluded that: (1) although the visibility does not continue to deteriorate from 1993 to November 2009 in Taichung City, it does not improve obviously also. The visibility in Taichung City was similar to Taipei area as averaged 9.6 km. (2) the basic describable statistics of visibility (averaged value  1.28 times standard deviation) was better than air pollutant index PSI when it comes to the classified index of visibility. (3) the experimental results of aerosol characteristic sampling in southern Taichung City show that the ratio of components in particles for daytime and nighttime were similar. (4) the results of model simulations and verified processes show that SO2 was effected by long term transportation of point sources, NOx was effected by traffic pollution of line sources and PM10 was effected by polluted amounts of area sources. (5) the best cost effective policy could be obtained based on different conditions of visibility upgrading from the experimental formula of visibility, phenomena factors and concentration of air quality, by using the trajectory model which simulated the reducing concentration of PM10 contributed ratio with multiple regression analysis

air quality, monitoring station, visibility, Non-Atomic Ionized Radiation Monitoring, Indoor Air Quality