Quality Assurance for Ambient Air Monitoring

The APCD seeks to produce the best quality of data possible. For ambient air pollution measurements, the APCD tries to meet or exceed US EPA quality assurance (QA) requirements. Minimum requirements are prescribed in 40 CFR 58, Appendix A, various appendices of 40 CFR 50 and the EPA Quality Assurance Handbook for Air Pollution Measurement Systems.

Components of Air Monitoring QA:

  • Standard operating procedures, approved by the State and EPA
  • Network design: Site selection based on desired monitoring objective, location of point sources, population distribution, etc.
  • Selection and purchase of air monitoring instruments, using knowledge of EPA reference and equivalent methods for air monitoring, and researching the reliability of instruments from different manufacturers.
  • Recruitment and training of qualified staff.
  • Traceability of standards (selection, inventory and regular recertification)
  • Calibrations
  • Zero/span checks
  • Control limits and corrective actions
  • Preventive and remedial maintenance
  • Quality control procedures for air pollution episode monitoring
  • Data audit and reporting
  • Data quality assessment: precision checks and performance audits
  • Reporting of results of precision and accuracy tests to EPA

More QA Information: