---
kind: "unit"
title: "40"
title_heading: "Protection of Environment"
key: "chI/subchC/part91"
level: "part"
label: "Part 91"
heading: "Control of Emissions from Marine Spark-Ignition Engines"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/40/chI-subchC-part91"
sections_count: 2
---

# Part 91 — Control of Emissions from Marine Spark-Ignition Engines

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

## Sections

- [§91.1. Applicability.](/cfr/40/91.1.md)
- [§91.2 through 91.3. Reserved](/cfr/40/91.2%20through%2091.3.md)