[Code of Federal Regulations] [Title 40, Volume 15] [Revised as of July 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR81.11] [Page 10] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 81--DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES--Table of Contents Subpart B--Designation of Air Quality Control Regions Sec. 81.11 Scope. Air quality control regions designated by the Administrator pursuant to section 107 of the Act are listed in this subpart. Regions so designated are subject to revision, and additional regions may be designated, as the Administrator determines necessary to protect the public health and welfare.