This project executing period was from May 8th 2012 to May 7th 2013. The main purpose of this project is aiming at non-periodically inspecting all current Environmental Protection Administration’s Air Quality Monitoring Stations to guarantee the quality of maintenance work and monitoring network data. The work content mainly included (1) the execution of monitoring instruments performance audit 80 stations/per year and repeat audit 5 stations/per year, (2) the execution of monitoring instruments functional check 486 stations/per year and track defects. In order to make the audit results more close to data accuracy for lower concentration of atmospheric monitoring, this project continued executing performance audit for lower concentration and zero air purity. The performance audit used independent instruments and standards, primarily inspected the deviation between the monitoring value and the standard value (accuracy), there were 160 stations completed within two years (2899 times), the satisfaction degree of recent two years espectively was 97.0%, 97.2%. The whole result of performance audit demonstrated the quality of monitoring stations’ data was good, and the degree of satisfaction presented escalating trend year by year. The functional check was mainly to focus on non-periodically surveys and assessments on stations house maintenance, facility equipments, the document recording conditions, the monitor operation conditions, the unusual data check and the monitoring instruments accuracy inspection. There were totally 972 functional checks (138381 times) had been finished. The whole result of functional check demonstrated the defect rate only 0.58% ,which presented high quality in sustaining operation and maintenance of monitoring stations. All defects from performance audit and functional check will be require to improve between three days to seven days, The EPA and this project will track situation of defects improvement.

Air Quality Monitoring Station；Quality Assurance；Performance Audit