§53.34. Test procedure for methods for PM 10 and Class I methods for PM 2.5 . — Inbound Citations

(f) A 10-day operational field test of measurement precision is required under § 53.58 for both FRM and Class I FEM samplers for PM 2.5. This test requires collocated operation of three candidate method samplers at a field test site. For candidate FEM samplers, this test may be combined and carried out concurrently with the test for comparability to the FRM specified under § 53.34, which requires collocated operation of three FRM samplers and three candidate FEM samplers.