CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER C—AIR PROGRAMS (Parts 50–99) > PART 57—PRIMARY NONFERROUS SMELTER ORDERS > SUBPART A—General (§57.101 to §57.111) > 57.101—Purpose and scope.

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.