[Code of Federal Regulations] [Title 40, Volume 17] [Revised as of July 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR81.34] [Page 16] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 81_DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES--Table of Subpart B_Designation of Air Quality Control Regions Sec. 81.34 Metropolitan Dayton Intrastate Air Quality Control Region. The Metropolitan Dayton Intrastate Air Quality Control Region consists of the territorial area encompassed by the boundaries of the following jurisdictions or described area (including the territorial area of all municipalities (as defined in section 302(f) of the Clean Air Act, 42 U.S.C. 1857h(f)) geographically located within the outermost boundaries of the area so delimited): In the State of Ohio: Clark County, Darke County, Greene County, Miami County, Montgomery County, Preble County.