---
kind: "unit"
title: "40"
title_heading: "Protection of Environment"
key: "chI/subchC/part52"
level: "part"
label: "Part 52"
heading: "Approval and Promulgation of Implementation Plans"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/40/chI-subchC-part52"
sections_count: 1106
---

# Part 52 — Approval and Promulgation of Implementation Plans

Title 40 C.F.R. — Protection of Environment › Chapter I — Environmental Protection Agency › Subchapter C — Air Programs

## Contents

- [Subpart A — General Provisions](/cfr/40/chI-subchC-part52-subpartA.md)
- [Subpart B — Alabama](/cfr/40/chI-subchC-part52-subpartB.md)
- [Subpart C — Alaska](/cfr/40/chI-subchC-part52-subpartC.md)
- [Subpart D — Arizona](/cfr/40/chI-subchC-part52-subpartD.md)
- [Subpart E — Arkansas](/cfr/40/chI-subchC-part52-subpartE.md)
- [Subpart F — California](/cfr/40/chI-subchC-part52-subpartF.md)
- [Subpart G — Colorado](/cfr/40/chI-subchC-part52-subpartG.md)
- [Subpart H — Connecticut](/cfr/40/chI-subchC-part52-subpartH.md)
- [Subpart I — Delaware](/cfr/40/chI-subchC-part52-subpartI.md)
- [Subpart J — District of Columbia](/cfr/40/chI-subchC-part52-subpartJ.md)
- [Subpart K — Florida](/cfr/40/chI-subchC-part52-subpartK.md)
- [Subpart L — Georgia](/cfr/40/chI-subchC-part52-subpartL.md)
- [Subpart M — Hawaii](/cfr/40/chI-subchC-part52-subpartM.md)
- [Subpart N — Idaho](/cfr/40/chI-subchC-part52-subpartN.md)
- [Subpart O — Illinois](/cfr/40/chI-subchC-part52-subpartO.md)
- [Subpart P — Indiana](/cfr/40/chI-subchC-part52-subpartP.md)
- [Subpart Q — Iowa](/cfr/40/chI-subchC-part52-subpartQ.md)
- [Subpart R — Kansas](/cfr/40/chI-subchC-part52-subpartR.md)
- [Subpart S — Kentucky](/cfr/40/chI-subchC-part52-subpartS.md)
- [Subpart T — Louisiana](/cfr/40/chI-subchC-part52-subpartT.md)
- [Subpart U — Maine](/cfr/40/chI-subchC-part52-subpartU.md)
- [Subpart V — Maryland](/cfr/40/chI-subchC-part52-subpartV.md)
- [Subpart W — Massachusetts](/cfr/40/chI-subchC-part52-subpartW.md)
- [Subpart X — Michigan](/cfr/40/chI-subchC-part52-subpartX.md)
- [Subpart Y — Minnesota](/cfr/40/chI-subchC-part52-subpartY.md)
- [Subpart Z — Mississippi](/cfr/40/chI-subchC-part52-subpartZ.md)
- [Subpart AA — Missouri](/cfr/40/chI-subchC-part52-subpartAA.md)
- [Subpart BB — Montana](/cfr/40/chI-subchC-part52-subpartBB.md)
- [Subpart CC — Nebraska](/cfr/40/chI-subchC-part52-subpartCC.md)
- [Subpart DD — Nevada](/cfr/40/chI-subchC-part52-subpartDD.md)
- [Subpart EE — New Hampshire](/cfr/40/chI-subchC-part52-subpartEE.md)
- [Subpart FF — New Jersey](/cfr/40/chI-subchC-part52-subpartFF.md)
- [Subpart GG — New Mexico](/cfr/40/chI-subchC-part52-subpartGG.md)
- [Subpart HH — New York](/cfr/40/chI-subchC-part52-subpartHH.md)
- [Subpart II — North Carolina](/cfr/40/chI-subchC-part52-subpartII.md)
- [Subpart JJ — North Dakota](/cfr/40/chI-subchC-part52-subpartJJ.md)
- [Subpart KK — Ohio](/cfr/40/chI-subchC-part52-subpartKK.md)
- [Subpart LL — Oklahoma](/cfr/40/chI-subchC-part52-subpartLL.md)
- [Subpart MM — Oregon](/cfr/40/chI-subchC-part52-subpartMM.md)
- [Subpart NN — Pennsylvania](/cfr/40/chI-subchC-part52-subpartNN.md)
- [Subpart OO — Rhode Island](/cfr/40/chI-subchC-part52-subpartOO.md)
- [Subpart PP — South Carolina](/cfr/40/chI-subchC-part52-subpartPP.md)
- [Subpart QQ — South Dakota](/cfr/40/chI-subchC-part52-subpartQQ.md)
- [Subpart RR — Tennessee](/cfr/40/chI-subchC-part52-subpartRR.md)
- [Subpart SS — Texas](/cfr/40/chI-subchC-part52-subpartSS.md)
- [Subpart TT — Utah](/cfr/40/chI-subchC-part52-subpartTT.md)
- [Subpart UU — Vermont](/cfr/40/chI-subchC-part52-subpartUU.md)
- [Subpart VV — Virginia](/cfr/40/chI-subchC-part52-subpartVV.md)
- [Subpart WW — Washington](/cfr/40/chI-subchC-part52-subpartWW.md)
- [Subpart XX — West Virginia](/cfr/40/chI-subchC-part52-subpartXX.md)
- [Subpart YY — Wisconsin](/cfr/40/chI-subchC-part52-subpartYY.md)
- [Subpart ZZ — Wyoming](/cfr/40/chI-subchC-part52-subpartZZ.md)
- [Subpart AAA — Guam](/cfr/40/chI-subchC-part52-subpartAAA.md)
- [Subpart BBB — Puerto Rico](/cfr/40/chI-subchC-part52-subpartBBB.md)
- [Subpart CCC — Virgin Islands](/cfr/40/chI-subchC-part52-subpartCCC.md)
- [Subpart DDD — American Samoa](/cfr/40/chI-subchC-part52-subpartDDD.md)
- [Subpart EEE — Approval and Promulgation of Plans](/cfr/40/chI-subchC-part52-subpartEEE.md)
- [Subpart FFF — Commonwealth of the Northern Mariana Islands](/cfr/40/chI-subchC-part52-subpartFFF.md)