40 CFR § 81.130 - Southern Tier East Intrastate Air Quality Control Region.

The Southern Tier East Intrastate Air Quality Control Region (New York) 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 New York: Broome County, Chenango County, Delaware County, Otsego County, Sullivan County, Tioga County.