40 CFR § 51.913 - How do the section 182(f) NO exemption provisions apply for the 8-hour NAAQS?

---
identifier: "/us/cfr/t40/s51.913"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 51.913 - How do the section 182(f) NO exemption provisions apply for the 8-hour NAAQS?"
title_number: 40
title_name: "Protection of Environment"
section_number: "51.913"
section_name: "How do the section 182(f) NO exemption provisions apply for the 8-hour NAAQS?"
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "51"
part_name: "REQUIREMENTS FOR PREPARATION, ADOPTION, AND SUBMITTAL OF IMPLEMENTATION PLANS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "23 U.S.C. 101; 42 U.S.C. 7401-7671q."
regulatory_source: "36 FR 22398, Nov. 25, 1971, unless otherwise noted."
cfr_part: "51"
---


# 51.913 How do the section 182(f) NO exemption provisions apply for the 8-hour NAAQS?

(a) A person may petition the Administrator for an exemption from NO<sub>X</sub> obligations under section 182(f) for any area designated nonattainment for the 8-hour ozone NAAQS and for any area in a section 184 ozone transport region.

(b) The petition must contain adequate documentation that the criteria in section 182(f) are met.

(c) A section 182(f) NO<sub>X</sub> exemption granted for the 1-hour ozone standard does not relieve the area from any NO<sub>X</sub> obligations under section 182(f) for the 8-hour ozone standard.

[70 FR 71701, Nov. 29, 2005]