Control of Air Pollution From New Motor Vehicles: Heavy-Duty Engine and Vehicles Standards and Highway Diesel Fuel Sulfur Control Requirements

"As part of this program, new emission standards will begin to take effect in model year 2007, and will apply to heavy-duty highway engines and vehicles. These standards are based on the use of high-efficiency catalytic exhaust emission control devices or comparably effective advanced technologies. Because these devices are damaged by sulfur, we are also reducing the level of sulfur in highway diesel fuel significantly by mid-2006."

"This program will reduce particulate matter and oxides of nitrogen emissions from heavy duty engines by 90 percent and 95 percent below current standard levels, respectively. In order to meet these more stringent standards for diesel engines, the program calls for a 97 percent reduction in the sulfur content of diesel fuel. As a result, diesel vehicles will achieve gasoline-like exhaust emission levels."

40 CFR 69, 80, 86; 66 Fed. Reg. 5001 (January 18, 2001) (TXT; PDF)

Key Components:

  • PM emissions standard: 0.01 g/bhp-hr. ALL Model Year 2007 heavy-duty engines must comply.
  • NOx emissions standard: 0.20 g/bhp-hr. This standard is gradually phased in beginning with Model Year 2007. FULL compliance is required by 2010.
  • Non-Methane Hydrocarbons (NMHC) emissions standard: 0.14 g/bhp-hr. This standard is gradually phased in beginning with Model Year 2007. FULL compliance is required by 2010.
  • Beginning June 1, 2006 refiners can only produce diesel fuel for use in highway vehicles with a sulfur content of no more than 15 parts per million (ppm).
    • Highway diesel fuel sold at the terminal level must meet the 15 ppm requirements by July 15, 2006.
    • Highway diesel fuel sold in retail stations must meet the 15 ppm requirements by September 1, 2006.
    • Refiners that choose to produce 15 ppm sulfur content diesel fuel before June 1, 2006 can obtain credits to exempt up to 20% of the diesel fuel they sell from the new requirements.
  • These rules will result in reductions of PM by 90% and NOx by 95% from current heavy duty engine emissions. The rules will reduce sulfur content in diesel fuel by 97% from current levels.

For More Information:

  • 2007 Heavy Duty Engine Standards; 2006 Sulfur Diesel Rules (TXT; PDF)
  • EPA Website
  • EPA Factsheet (PDF)