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) > 57.106—Expiration date.

57.106—Expiration date.

Each NSO shall state its expiration date. No NSO issued under this regulation shall expire later than January 1, 1988.