---
kind: "unit"
title: "40"
title_heading: "Protection of Environment"
key: "chI/subchU"
level: "subchap"
label: "Subchapter U"
heading: "Air Pollution Controls"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/40/chI-subchU"
sections_count: 1294
---

# Subchapter U — Air Pollution Controls

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

## Contents

- [Part 1000-1026 — Parts 1000-1026 [reserved]](/cfr/40/chI-subchU-part1000-1026.md)
- [Part 1027 — Fees for Vehicle and Engine Compliance Programs](/cfr/40/chI-subchU-part1027.md)
- [Part 1030 — Control of Greenhouse Gas Emissions from Engines Installed on Airplanes](/cfr/40/chI-subchU-part1030.md)
- [Part 1031 — Control of Air Pollution from Aircraft Engines](/cfr/40/chI-subchU-part1031.md)
- [Part 1033 — Control of Emissions from Locomotives](/cfr/40/chI-subchU-part1033.md)
- [Part 1036 — Control of Emissions from New and In-Use Heavy-Duty Highway Engines](/cfr/40/chI-subchU-part1036.md)
- [Part 1037 — Control of Emissions from New Heavy-Duty Motor Vehicles](/cfr/40/chI-subchU-part1037.md)
- [Part 1039 — Control of Emissions from New and In-Use Nonroad Compression-Ignition Engines](/cfr/40/chI-subchU-part1039.md)
- [Part 1042 — Control of Emissions from New and In-Use Marine Compression-Ignition Engines and Vessels](/cfr/40/chI-subchU-part1042.md)
- [Part 1043 — Control of Nox, Sox, and Pm Emissions from Marine Engines and Vessels Subject to the Marpol Protocol](/cfr/40/chI-subchU-part1043.md)
- [Part 1045 — Control of Emissions from Spark-Ignition Propulsion Marine Engines and Vessels](/cfr/40/chI-subchU-part1045.md)
- [Part 1048 — Control of Emissions from New, Large Nonroad Spark-Ignition Engines](/cfr/40/chI-subchU-part1048.md)
- [Part 1051 — Control of Emissions from Recreational Engines and Vehicles](/cfr/40/chI-subchU-part1051.md)
- [Part 1054 — Control of Emissions from New, Small Nonroad Spark-Ignition Engines and Equipment](/cfr/40/chI-subchU-part1054.md)
- [Part 1060 — Control of Evaporative Emissions from New and In-Use Nonroad and Stationary Equipment](/cfr/40/chI-subchU-part1060.md)
- [Part 1065 — Engine-Testing Procedures](/cfr/40/chI-subchU-part1065.md)
- [Part 1066 — Vehicle-Testing Procedures](/cfr/40/chI-subchU-part1066.md)
- [Part 1068 — General Compliance Provisions for Highway, Stationary, and Nonroad Programs](/cfr/40/chI-subchU-part1068.md)
- [Part 1074 — Preemption of State Standards and Procedures for Waiver of Federal Preemption for Nonroad Engines and Nonroad Vehicles](/cfr/40/chI-subchU-part1074.md)
- [Part 1075-1089 — Parts 1075-1089 [reserved]](/cfr/40/chI-subchU-part1075-1089.md)
- [Part 1090 — Regulation of Fuels, Fuel Additives, and Regulated Blendstocks](/cfr/40/chI-subchU-part1090.md)
- [Part 1091-1099 — Parts 1091-1099 [reserved]](/cfr/40/chI-subchU-part1091-1099.md)