40 CFR § 57.101 - Purpose and scope.

---
identifier: "/us/cfr/t40/s57.101"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 57.101 - Purpose and scope."
title_number: 40
title_name: "Protection of Environment"
section_number: "57.101"
section_name: "Purpose and scope."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "57"
part_name: "PRIMARY NONFERROUS SMELTER ORDERS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
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."
regulatory_source: "50 FR 6448, Feb. 15, 1985, unless otherwise noted."
cfr_part: "57"
---


# 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 of the Clean Air Act.