Regulations for Emissions from Heavy Equipment with Compression-Ignition (Diesel) Engines

• Overview
• List of related e-CFR links
• List of related regulations

Overview

This page provides regulations for nonroad compression-ignition (diesel) engines that are used in machines that perform a wide range of important jobs. These include excavators and other construction equipment, farm tractors and other agricultural equipment, forklifts, airport ground service equipment, and utility equipment such as generators, pumps, and compressors.

EPA has adopted multiple tiers of emission standards. Most recently, we adopted a comprehensive national program to reduce emissions from nonroad diesel engines by integrating engine and fuel controls as a system to gain the greatest emission reductions. To meet these Tier 4 emission standards, engine manufacturers will produce new engines with advanced emission control technologies. Because the emission control devices can be damaged by sulfur, we have also adopted requirements for in-use diesel fuel to decrease sulfur levels by more than 99 percent. The resulting Ultra Low Sulfur Diesel Fuel has a maximum sulfur concentration of 15 parts per million.

Basic Research

Data for reproducing real-world activity of various nonroad compression ignition (CI, diesel) engines in a controlled setting is available on this page:
EPA Nonregulatory Nonroad Duty Cycles

List of Related e-CFR Links

See the Electronic Code of Federal Regulations (e-CFR) for the full text of current regulations that apply to large CI engines.

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List of Related Regulations

Below is a list of all regulations related to emissions from heavy equipment with compression-ignition (diesel) engines.

• Rule summaries;
• Regulatory impact analyses;
• Comment summaries;
• Rule histories (including proposed rules); and 
• Fact sheets.*

*Note: Rule-related materials vary by rule.