---
kind: "section"
citation: "40 C.F.R. § 57.601"
title: "40"
number: "57.601"
heading: "General requirements."
url: "https://uscodex.org/cfr/40/57.601"
---

# §57.601. General requirements.

- (a) This subpart is not applicable to NSOs which contain a SIP compliance schedule in accordance with [§ 57.705](/cfr/40/57.705.md).
- (b) The requirements of this subpart may be waived with respect to a smelter if the owner of that smelter submits with its NSO application a written certification by a corporate official authorized to make such a certification that the smelter will either comply with its SO2 SIP limits by January 2, 1988 or close after January 1, 1988 until it can comply with such limits.
- (c) Except as provided in paragraphs [(a)](#a) and [(b)](#b), each NSO shall require the smelter to conduct or participate in a specific research and development program designed to develop more effective means of compliance with the sulfur dioxide control requirements of the applicable State Implementation Plan than presently exist.

## 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.