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.