40 C.F.R. § 81.85
The Metropolitan Sioux Falls Interstate Air Quality Control Region (Iowa-South Dakota) has been 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 Iowa: Lyon County.
In the State of South Dakota: Lincoln County, McCook County, Minnehaha County, Turner County.
Note: For purposes of identification, this Region is referred to by Minnesota authorities as follows:
Sec.
481.60 Duluth (Minnesota)-Superior (Wisconsin) Interstate Air Quality Control Region: Northeast Minnesota Region.
For purposes of identification, these Regions are referred to by Wisconsin authorities as follows:
481.60 Duluth (Minnesota)-Superior (Wisconsin) Interstate Air Quality Control Region: Northwestern Wisconsin Region.
481.66 Southeast Minnesota-La Crosse (Wisconsin) Interstate Air Quality Control Region: West Central Wisconsin Region.
40 C.F.R. §81.85