---
kind: "unit"
title: "40"
title_heading: "Protection of Environment"
key: "chI/subchC/part93"
level: "part"
label: "Part 93"
heading: "Determining Conformity of Federal Actions to State or Federal Implementation Plans"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/40/chI-subchC-part93"
sections_count: 46
---

# Part 93 — Determining Conformity of Federal Actions to State or Federal Implementation Plans

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

## Contents

- [Subpart A — Conformity to State or Federal Implementation Plans of Transportation Plans, Programs, and Projects Developed, Funded or Approved Under Title 23 U.S.C. or the Federal Transit Laws](/cfr/40/chI-subchC-part93-subpartA.md)
- [Subpart B — Determining Conformity of General Federal Actions to State or Federal Implementation Plans](/cfr/40/chI-subchC-part93-subpartB.md)