40 CFR § 52.172 - Approval status.

---
identifier: "/us/cfr/t40/s52.172"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 52.172 - Approval status."
title_number: 40
title_name: "Protection of Environment"
section_number: "52.172"
section_name: "Approval status."
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"
---


# 52.172 Approval status.

With the exceptions set forth in this subpart, the Administrator approves Arkansas's state implementation plan under section 110 of the Clean Air Act. Furthermore, the Administrator finds that the plan satisfies all applicable requirements of Parts C and D, Title I, of the Clean Air Act as amended in 1990, except as noted below.

[81 FR 32241, May 23, 2016, as amended at 83 FR 38968, Aug. 8, 2018]