• "2007 Heavy-Duty Highway Rule" (PDF) (Clean Diesel Trucks, Buses, and Fuel: Heavy-Duty Engine and Vehicle Standards and Highway Diesel Fuel Sulfur Control Requirements Final Rule) - published January 18, 2001
• Clean Air Non-road Diesel - Tier 4 Final Rule (PDF) - published June 29, 2004
• Control of Air Pollution From Motor Vehicles and Non-road Diesel Engines (PDF) - Alternative Low-Sulfur Diesel Fuel Transition Program for Alaska, published June 6, 2006
• Standards of Performance for Stationary Compression Ignition Internal Combustion Engines (PDF) - published July 11, 2006
• EPA's Clean Diesel Web Page
• EPA's fact sheet on Federal Ultra-Low Sulfur Diesel Fuel Requirements (PDF)