40 CFR § 72.51 - Permit shield.

---
identifier: "/us/cfr/t40/s72.51"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 72.51 - Permit shield."
title_number: 40
title_name: "Protection of Environment"
section_number: "72.51"
section_name: "Permit shield."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "72"
part_name: "PERMITS REGULATION"
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, 7403, 7410, 7411, 7426, 7601,"
regulatory_source: "58 FR 3650, Jan. 11, 1993, unless otherwise noted."
cfr_part: "72"
---


# 72.51 Permit shield.

Each affected unit operated in accordance with the Acid Rain permit that governs the unit and that was issued in compliance with title IV of the Act, as provided in this part and parts 73, 74, 75, 76, 77, and 78 of this chapter shall be deemed to be operating in compliance with the Acid Rain Program, except as provided in § 72.9(g)(6).

[58 FR 3650, Jan. 11, 1993, as amended at 62 FR 55481, Oct. 24, 1997]