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Federal Equivalent Methods and Federal Reference Methods. Tim Hanley U.S. EPA OAQPS. FRM=Federal Reference Method FEM = Federal Equivalent Method. For NAAQS. If comparing to standard, MUST use FRM or FEM; see 40 CFR 50.7
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Federal Equivalent Methods and Federal Reference Methods Tim Hanley U.S. EPA OAQPS
For NAAQS • If comparing to standard, MUST use FRM or FEM; see 40 CFR 50.7 • Also look at Appendix C to 40 CFR Part 58 – Ambient Air Quality Monitoring Methodology • You may have purposes other than comparing to NAAQS, and you may want different types of instruments to suit your goals
§50.7 NAAQS for Particulate Matter 2.5 Microns and Smaller • Reference methods based on 40 CFR 50 App. L for PM2.5—manual filter changes only • CFR says if equivalent methods for PM2.5 are designated as per 40 CFR 53, they may be used to compare with NAAQS, but… • NO non-manual methods for PM2.5 yet (and no plans for national equivalent methods for PM2.5 using non-manual methods)
§50.7 Naaqs for Particulate Matter 10 Microns and Smaller • FRM are all filter-based methods (40 CFR 50 App. J) • FEM include continuous methods (40 CFR 53) • BOTH can be compared to the NAAQS for PM10 (40 CFR 50.7)
2 Methods are FRM for PM10 • HiVol method (used for TSP) with PM10 inlet that directs only PM10 to filter; guidance in EPA Handbook 2.11 • LoVol sampling at 16.7 L/m; see EPA Handbook 2.10; can be either: • Dichot method which split into PM2.5 and PM10; both filters are weighed • LoVol sampler (R&P, Andersen, and BGI all approved as FRM PM10 without use of second- stage separator)
FEM • PM10 automated • TEOM • R&P • BAM-type • Anderson, MetOne, Wedding/Thermo • PM2.5 • BGI with VSCC • R&P Partisol with BGI VSCC • Both still require manual filter changes