The Environmental Protection Agency is targeting off-road diesel engines for significant reductions in emissions.

These engines typically are used in construction, agriculture and industrial equipment.
The proposal, which would begin to take effect in 2008, calls for 90% reductions in particulate matter, or soot, and nitrogen oxides (NOx). It mirrors the reductions currently planned for on-highway diesels in 2007.
EPA also noted that it is calling for dramatic reductions in the level of sulfur in diesel fuel –- from the current 3,400 parts per million to 500 ppm in 2007 and 15 ppm in 2010.
"This action represents a strong commitment from the Bush administration to take the next step to achieve cleaner air and protect the health of all Americans," said EPA Administrator Christie Whitman in a prepared statement. "Coupled with the 2007 diesel rule for highway trucks and our school bus retrofit program, these actions will be the most far-reaching diesel programs in the world today."
For details, see Heavy Duty Trucking and RoadStar magazines.