“Taiwan Air Quality Monitoring Network (TAQMN)” of Environment Protection Agency(EPA) have been established and started to run since 1993. Until now, TAQMN have had set up with 73 air quality automonitoring stations, 2 movable monitoring stations ,2 mobile vans, and 1 “Quality Assurance Laboratory”. To ensure the quality of monitoring data, EPA authorized an independent private sector to performance audit and regular performance check for monitoring equipment of TAQMN. Since 1994, the authorized sector has run relative projects, exsample: 「Air Quality Monitoring Inspection Assurance project」and 「Air Quality Monitoring Equipments Assurance project」etc. By these project, the quality of monitoring data form the monitoring stations can be ensure. There were two main working items of this project this year: 1. Performance Audit of TAQMN (88 monitoring stations, including mobile vans). 2. Regular Performance Check of TAQMN(including 73 automonitoring stations,2 movable monitoring station ,and 2 mobile vans). From the year audit results, over 80% satisfactory rate occupied up to 80% among all the auditing monitoring stations. It shows the monitoring stations system working well. Da-Li station and Guan-yin station each satisfactory rate is 47% and 57%. From the year audit instruments results, acid rain meter-conductivity satisfactory rate 53% is lowest item. PM2.5 and calibrator-air satisfactory rate 67% is second lowest. Besides, temperature 、wind direction 、calibrator-gas each satisfactory rate is 70%、77% and 78%. Therefore, audit result from meteorological monitoring equipment is not well. From the monitoring stations’ data for pass years, the Z factor from Wan-Hua、Da-Yuan、Guan-yin station is lower than 0 for 4 years, The result indicated this monitoring stations didn’t work well. Besides, Z factor from Feng-Shan and Er-lin station have been reducing trend since 1998. The statistical data of satisfactory rate since 1996 to 2001 indicated, air pollutant equipment and PM10 satisfactory rate is over 90%, meteorological monitoring equipment satisfactory rate is over 80%. From the result of regular check for all monitoring stations,the unqualified rate of PM2.5 flow rate and dew point temperature is 11% which the highest unqualified rate among all the regular check items. CH4 response value in correction procedure unqualified rate 8.5% is third highest. Besides,filter paper from PM2.5 monitor abnormal and Trouble Shoot from PM10 monitor abnormal each unqualified rate 8.2% and 7.1% is more high unqualified rate. We commend the maintenance institute shall pay more attention on the bad working stations. Besides, the weather equipments are located outside, and they will be effected by outside environment. Therefore, we suggest to pay more attention on the maintenance of the equipments.

monitoring station,audit