§53.53. Test for flow rate accuracy, regulation, measurement accuracy, and cut-off. — Inbound Citations

(b) 2.5 methods—(1) Reference method. A sampler associated with a candidate reference method for PM 2.5 shall be subject to the provisions, specifications, and test procedures prescribed in §§ 53.51 through 53.58.

(2) A sampler associated with a candidate Class I equivalent method for PM 2.5 shall be subject to the provisions, specifications, and test procedures prescribed in all sections of this subpart.

(3) A sampler associated with a candidate Class II equivalent method for PM 2.5 shall be subject to the provisions, specifications, and test procedures prescribed in all applicable sections of this subpart, as specified in subpart F of this part or as specified in § 53.3(a)(3).