40 CFR § 52.2922 - Significant deterioration of air quality.

---
identifier: "/us/cfr/t40/s52.2922"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 52.2922 - Significant deterioration of air quality."
title_number: 40
title_name: "Protection of Environment"
section_number: "52.2922"
section_name: "Significant deterioration of air quality."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "52"
part_name: "APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401"
cfr_part: "52"
---


# 52.2922 Significant deterioration of air quality.

(a) The requirements of sections 160 through 165 of the Clean Air Act are not met, since the plan does not include approvable procedures for preventing the significant deterioration of air quality.

(b) *Regulations for preventing significant deterioration of air quality.* The provisions of § 52.21 except paragraphs (a)(1), (b)(14)(i)(*a*) and (*b*), (b)(14)(ii)(*a*) and (*b*), (i)(5)(i)(*c*), and (k)(2) are hereby incorporated and made a part of the applicable plan for the Commonwealth of the Northern Mariana Islands.

(c) For the purposes of applying the requirements of § 52.21 within the Commonwealth of the Northern Mariana Islands, the terms “major source baseline date” and “trigger date” mean January 13, 1997 in the case of sulfur dioxide, PM<sub>10</sub>, and nitrogen dioxide.

[79 FR 22035, Apr. 21, 2014]