---
kind: "section"
citation: "40 C.F.R. § 57.101"
title: "40"
number: "57.101"
heading: "Purpose and scope."
url: "https://uscodex.org/cfr/40/57.101"
---

# §57.101. Purpose and scope.

- (a) **Applicability of the regulations.** The regulations in subparts A through H govern:
  - (1) The eligibility of smelters for a Primary Nonferrous Smelter Order (NSO) under section 119 of the Clean Air Act;
  - (2) The procedures through which an NSO can be approved or issued by EPA; and
  - (3) **The minimum contents of each NSO required for EPA issuance or approval under section 119.** Subpart I et seq., will contain NSOs in effect for individual smelters.
- (b) **State authority to adopt more stringent requirements.** Nothing in this part shall preclude a State from imposing more stringent requirements, as provided by [section 116](/cfr/40/116.md) of the Clean Air Act.

## Notes

### Authority

Authority: Secs. 110, 114, 119, 301, Clean Air Act, as amended (42 U.S.C. 7410, 7414, 7419, and 7601); sec. 406 of Pub. L. 95-95.

### Source

Source: 50 FR 6448, Feb. 15, 1985, unless otherwise noted.