[Code of Federal Regulations] [Title 40, Volume 17] [Revised as of July 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR81.14] [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. 81.14 Metropolitan Chicago Interstate Air Quality Control Region. The Metropolitan Chicago Interstate Air Quality Control Region (Illinois-Indiana) is revised to consist 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 Illinois: Cook County, Du Page County, Grundy County, Kane County, Kankakee County, Kendall County, Lake County, McHenry County, Will County. In the State of Indiana: Lake County, Porter County. [[Page 11]]