This project executing period was from May 8th 2009 to May 7th 2011. The main purpose of this project is aiming at non-periodically inspecting and auditing all current Environmental Protection Administration’s Air Quality Monitoring Stations to guarantee the quality of monitoring network data. The work content mainly included (1) the execution of monitoring instruments performance audit 80 stations/per year, (2) the execution of monitoring instruments functional check 486 stations/per year, (3) submit the quarterly reports of monitoring data quality. The performance audit primarily inspected the error between the monitoring data and the standard value (accuracy), there were 160 stations completed within two years , audited items total was 2875, just 96 items does not meet the audit quality objectives, the degree of satisfaction was 96.7%. The satisfaction degree of recent four years respectively was 96.2%, 96.2%, 96.8%, and 96.5%. According to the monitoring instrument type, the highest satisfaction degree was 99.2% performed by gaseous monitoring instruments, the second one was 98.1% done by particle monitoring instruments and the lowest one was 92.8% done by meteorological monitoring instruments. Another 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 within two years ,checked items total was 134217, just finded 779 items missing, the whole result of functional check demonstrated the defect rate only 0.58%. Which presented declining trend year by year due to the high quality in sustaining operation and maintenance of monitoring stations. According to different kind of functional check result, the unqualified defects were shown in sequence. The highest defect rate was accuracy check 1.62%, the second was station & facility equipments 0.66%, meteorological instruments 0.42%, then malfunctioned monitors 0.39%, and finally document recording conditions 0.33%. In order to assessment the quality of monitoring data and maintenance management condition, total submitted 8 times quarterly reports of monitoring data quality, the report content included the results of quality assurance, the maintenance management conditions, the availability of monitoring data, and another related contents.

Air Quality Monitoring Station;Quality Assurance;Performance Audit