[Code of Federal Regulations] [Title 40, Volume 3] [Revised as of July 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR52.04] [Page 10] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 52--APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS--Table of Contents Subpart A--General Provisions Sec. 52.04 Classification of regions. Each subpart sets forth the priority classification, by pollutant, for each region in the State. Each plan for each region was evaluated according to the requirements of part 51 of this chapter applicable to regions of that priority. [[Page 11]]