• Subpart NN [§ 52.2020 - § 52.2065] - Subpart NN—Pennsylvania

• Subpart OO [§ 52.2070 - § 52.2089] - Subpart OO—Rhode Island

• Subpart PP [§ 52.2120 - § 52.2141] - Subpart PP—South Carolina

• Subpart QQ [§ 52.2170 - § 52.2186] - Subpart QQ—South Dakota

• Subpart RR [§ 52.2219 - § 52.2241] - Subpart RR—Tennessee

• Subpart SS [§ 52.2270 - § 52.2312] - Subpart SS—Texas

• Subpart TT [§ 52.2320 - § 52.2356] - Subpart TT—Utah

• Subpart UU [§ 52.2370 - § 52.2386] - Subpart UU—Vermont

• Subpart VV [§ 52.2420 - § 52.2465] - Subpart VV—Virginia

• Subpart WW [§ 52.2470 - § 52.2502] - Subpart WW—Washington

• Subpart XX [§ 52.2520 - § 52.2565] - Subpart XX—West Virginia

• Subpart YY [§ 52.2569 - § 52.2593] - Subpart YY—Wisconsin

• Subpart ZZ [§ 52.2620 - § 52.2637] - Subpart ZZ—Wyoming

• Subpart AAA [§ 52.2670 - § 52.2686] - Subpart AAA—Guam

• Subpart BBB [§ 52.2720 - § 52.2732] - Subpart BBB—Puerto Rico

• Subpart CCC [§ 52.2770 - § 52.2782] - Subpart CCC—Virgin Islands

• Subpart DDD [§ 52.2820 - § 52.2827] - Subpart DDD—American Samoa

• Subpart EEE [§ 52.2850 - § 52.2850] - Subpart EEE—Approval and Promulgation of Plans

• Subpart FFF [§ 52.2900 - § 52.2999] - Subpart FFF—Commonwealth of the Northern Mariana Islands

• Appendix Appendix F - Appendix F to Part 52—Clean Air Act Section 126 Petitions From Eight Northeastern States: Named Source Categories and Geographic Coverage