As used in this part, all terms not defined herein shall have the meaning given them by the Act.

(a) Act means the Clean Air Act as amended (42 U.S.C. 7401, et seq.).

(b) Administrator means the Administrator of the Environmental Protection Agency or his authorized representative.

(c) Federal Indian Reservation, Indian Reservation or Reservation means all land within the limits of any Indian reservation under the jurisdiction of the United States government, notwithstanding the issuance of any patent, and including rights-of-way running through the reservation.

(d) Indian tribe or tribe means any Indian tribe, band, nation, or other organized group or community, including any Alaska Native village, which is federally recognized as eligible for the special programs and services provided by the United States to Indians because of their status as Indians.

(e) State means a state, the District of Columbia, the Commonwealth of Puerto Rico, the Virgin Islands, Guam, and American Samoa and includes the Commonwealth of the Northern Mariana Islands.