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Regulations last checked for updates: May 17, 2025
Title 40 - Protection of Environment last revised: Nov 17, 2025
All Titles
Title 40
Chapter I
Part 49 - PART 49—INDIAN COUNTRY: AIR QUALITY PLANNING AND MANAGEMENT
Subpart A [§ 49.1 - § 49.50] - Subpart A—Tribal Authority
Subpart B [§ 49.51 - § 49.100] - Subpart B—General Provisions
Subpart C [§ 49.101 - § 49.173] - Subpart C—General Federal Implementation Plan Provisions
Subpart D [§ 49.201 - § 49.470] - Subpart D—Implementation Plans for Tribes—Region I
Subpart E [§ 49.471 - § 49.680] - Subpart E—Implementation Plans for Tribes—Region II
Subpart F [§ 49.681 - § 49.710] - Subpart F—Implementation Plans for Tribes—Region III
Subpart G [§ 49.711 - § 49.920] - Subpart G—Implementation Plans for Tribes—Region IV
Subpart H [§ 49.921 - § 49.1970] - Subpart H—Implementation Plans for Tribes—Region V
Subpart I [§ 49.1971 - § 49.3920] - Subpart I—Implementation Plans for Tribes—Region VI
Subpart J [§ 49.3921 - § 49.4160] - Subpart J—Implementation Plans for Tribes—Region VII
Subpart K [§ 49.4161 - § 49.5510] - Subpart K—Implementation Plans for Tribes—Region VIII
Subpart L [§ 49.5511 - § 49.9860] - Subpart L—Implementation Plans for Tribes—Region IX
Subpart M [§ 49.9861 - § 49.17810] - Subpart M—Implementation Plans for Tribes—Region X
authority:
42 U.S.C. 7401
,
source:
63 FR 7271, Feb. 12, 1998, unless otherwise noted.
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