---
kind: "section"
citation: "40 C.F.R. § 81.455"
title: "40"
number: "81.455"
heading: "Scope."
url: "https://uscodex.org/cfr/40/81.455"
---

# §81.455. Scope.


This subpart identifies interstate transport regions established for national ambient air quality standards pursuant to [section 184](/cfr/40/184.md) or [section 176A](/cfr/40/176A.md) of the Clean Air Act.


## Notes

### Source

Source: 87 FR 7746, Feb. 10, 2022, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7401, et seq.

### Source

Source: 36 FR 22421, Nov. 25, 1971, unless otherwise noted.