[Code of Federal Regulations] [Title 40, Volume 8] [Revised as of July 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR61.17] [Page 40] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 61_NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS--Table of Contents Subpart A_General Provisions Sec. 61.17 State authority. (a) This part shall not be construed to preclude any State or political subdivision thereof from-- (1) Adopting and enforcing any emission limiting regulation applicable to a stationary source, provided that such emission limiting regulation is not less stringent than the standards prescribed under this part; or (2) Requiring the owner or operator of a stationary source to obtain permits, licenses, or approvals prior to initiating construction, modification, or operation of the source. [50 FR 46294, Nov. 7, 1985]