title: Annual recertification program for audit standards used in the EPA PM2.5 Performance Evaluation Program.
abstract: This paper describes procedures used to perform 152 annual recertifications of temperature, pressure, and flow rate audit standards. It discusses the metrology laboratories and the uncertainty of their recertifications. It describes the data base for the standards that tracks their recertifications and shipments. Finally, it presents some illustrative recertification results and describes what these results reveal about the audit standards and the recertifications.
authors.affiliation: RTI International, P.O. Box 12194, Research Triangle Park, NC 27709-2194, USA. rsw@rti.org
authors.forename: R S
authors.initials: RS
authors.lastname: Wright
authors.forename: J S
authors.initials: JS
authors.lastname: Nichol
authors.forename: M L
authors.initials: ML
authors.lastname: Papp
authors.forename: P W
authors.initials: PW
authors.lastname: Groff
authors.forename: M W
authors.initials: MW
authors.lastname: Tufts
mesh_terms: D016902:Air Pollution, Indoor / Q000517:prevention & control*; D002568:Certification; D003628:Database Management Systems; D004784:Environmental Monitoring / Q000592:standards*; D006801:Humans; D007753:Laboratories / Q000331:legislation & jurisprudence / Q000592:standards*; D008330:Management Audit / Q000592:standards*; D014481:United States; D014484:United States Environmental Protection Agency