40 CFR § 53.8 - Designation of reference and equivalent methods.

---
identifier: "/us/cfr/t40/s53.8"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 53.8 - Designation of reference and equivalent methods."
title_number: 40
title_name: "Protection of Environment"
section_number: "53.8"
section_name: "Designation of reference and equivalent methods."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "53"
part_name: "AMBIENT AIR MONITORING REFERENCE AND EQUIVALENT METHODS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "Sec. 301(a) of the Clean Air Act (42 U.S.C. sec. 1857g(a)), as amended by sec. 15(c)(2) of Pub. L. 91-604, 84 Stat. 1713, unless otherwise noted."
regulatory_source: "40 FR 7049, Feb. 18, 1975, unless otherwise noted."
cfr_part: "53"
---


# 53.8 Designation of reference and equivalent methods.

(a) A candidate method determined by the Administrator to satisfy the applicable requirements of this part shall be designated as an FRM or FEM (as applicable) by and upon publication of the designation in the *Federal Register.* Applicants shall not publicly announce, market, or sell the candidate sampler and analyzer as an approved FRM or FEM (as applicable) until the designation is published in the *Federal Register*.

(b) Upon designation, a notice indicating that the method has been designated as a FRM or FEM shall be sent to the applicant.

(c) The Administrator will maintain a current list of methods designated as FRM or FEM in accordance with this part and will send a copy of the list to any person or group upon request. A copy of the list will be available via the Internet and may be available from other sources.

[71 FR 61276, Oct. 17, 2006, as amended at 75 FR 35597, June 22, 2010; 89 FR 16382, Mar. 6, 2024]