Philadelphia Diesel Difference | Forging Partnerships To Reduce Diesel Emissions

"This comprehensive national program regulates nonroad diesel engines and diesel fuel as a system. New engine standards will begin to take effect in the 2008 model year, phasing in over a number of years. These standards are based on the use of advanced exhaust emission control devices. We estimate particulate matter reductions of 95 percent, nitrogen oxides reductions of 90 percent, and the virtual elimination of sulfur oxides from nonroad engines meeting the new standards. Nonroad diesel fuel sulfur reductions of more than 99 percent from existing levels will provide significant health benefits as well as facilitate the introduction of high-efficiency catalytic exhaust emission control devices as these devices are damaged by sulfur. These fuel controls will be phased-in starting in mid-2007. Today's nonroad final rule is largely based on the Environmental Protection Agency's 2007 highway diesel program."

40 CFR 9, 69, 80, 86, 89, 94, 1039, 1048, 1051, 1065, and 1068; 69 Fed. Reg. 38958 (June 29, 2004) (PDF)

Key Components:

Applicable for nonroad diesel engines - engines used mainly in construction, agricultural, industrial and mining operations.
For engines less than 25 horse-power:
- New 0.30 g/bhp-hr emissions standard for PM beginning Model Year 2008.
- Previous 5.6 g/bhp-hr combined standard for NMHC+NOx remains.
For engines of 25 to 75 horse-power:
- 50% reduction in PM emissions from current engine standards beginning Model Year 2008.
- New 0.02 g/bhp-hr emissions standard for PM and 3.5 g/bhp-hr for NMHC+NOx beginning Model Year 2013.
For engines of 75 to 175 horse-power:
- 0.01 g/bhp-hr emissions standard for PM beginning Model Year 2012.
- 0.30 g/bhp-hr emissions standard for NOx and 0.14 g/bhp-hr for NMHC beginning Model Year 2012, with both standards phased in over a 3 - 4 year period.
For engines of 175 to 750 horse-power:
- 0.01 g/bhp-hr emissions standard for PM beginning Model Year 2011.
- 0.30 g/bhp-hr emissions standard for NOx and 0.14 g/bhp-hr for NMHC beginning Model Year 2011, with both standards phased in over a 3 - 4 year period.
For engines above 750 horse-power:
- 0.075 g/bhp-hr emissions standard for PM and 0.30 g/bhp-hr emissions standard for NMHC starting in Model Year 2011.
- 0.02 g/bhp-hr emission standard for PM (for generator set engines), 0.03 g/bhp-hr emissions standard for PM (for non-generator set engines), and 0.14 g/bhp-hr emissions standard for NMHC starting in Model Year 2015.
- 0.50 g/bhp-hr emissions standard for NOx (for generator set engines above 1200 horse-power) starting in Model Year 2011. 2.6 g/bhp-hr emissions standard for NOx (for all non-generator set engines above 750 horse-power) starting in Model Year 2011. 0.50 g/bhp-hr emissions standard for NOx (for all non-generator set engines above 750 horse-power) starting in Model Year 2015.
June, 2007 all land-based nonroad, locomotive and marine engine diesel fuel will meet 500 ppm sulfur content.
June, 2010 all land-based nonroad diesel engine fuel will meet 15 ppm sulfur content.
June, 2012 locomotive and marine diesel engine fuel will meet 15 ppm sulfur content.
These rules will result in reductions of PM by 95% and NOx by 90% from current nonroad diesel engine emissions. The rules will reduce sulfur content in nonroad diesel fuel by 99% from current levels.

For More Information:

2008 Nonroad Diesel Engine Standards (PDF)
EPA Website
EPA Factsheet (TXT; PDF)