40 C.F.R. § 81.91
The Jacksonville (Florida)-Brunswick (Georgia) Interstate Air Quality Control Region 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 Florida: Alachua County, Baker County, Bradford County, Clay County, Columbia County, Dixie County, Duval County, Flagler County, Franklin County, Gadsden County, Gilchrist County, Hamilton County, Jefferson County, Lafayette County, Leon County, Liberty County, Madison County, Marion County, Nassau County, Putnam County, St. Johns County, Suwannee County, Taylor County, Union County, Wakulla County.
In the State of Georgia: Appling County, Atkinson County, Bacon County, Brantley County, Camden County, Charlton County, Clinch County, Coffee County, Glynn County, Long County, McIntosh County, Pierce County, Ware County, Wayne County.
40 C.F.R. §81.91