40 CFR § 52.2380 - Significant deterioration of air quality.

---
identifier: "/us/cfr/t40/s52.2380"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 52.2380 - Significant deterioration of air quality."
title_number: 40
title_name: "Protection of Environment"
section_number: "52.2380"
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: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401"
cfr_part: "52"
---


# 52.2380 Significant deterioration of air quality.

The program to review the construction and operation of new and modified major stationary sources in attainment areas is approved as meeting the requirements of Part C, except regulation 5-501(3) entitled “Default permits”, and a portion of the SIP revision narrative from the first full paragraph on pages 9-11 through the first four lines of pages 9-12 inclusive, both of which were submitted on March 21, 1979 and which are disapproved.

[45 FR 6784, Jan. 30, 1980]