Mack Trucks diesel engines have been certified by the U.S. Environmental Protection Agency and the California Air Resources Board for their 2010 emissions limits, which go into effect Jan. 1.

The Mack MP7 and MP8 engines are now officially recognized to meet the strictest diesel emissions standards in the world.

The Mack engines have been fully certified to meet EPA's stringent standards without the use of emissions credits.

"Achieving certification involved many dedicated employees working for many years," said Kevin Flaherty, Mack senior vice president. "The new Mack engines are so clean that in some areas, the exhaust leaving our trucks will be cleaner than the air going in."

Mack is using selective catalytic reduction (SCR) to bring nitrogen oxides (NOx) emissions down to EPA'10 levels. Mack tested SCR in North America customer fleets for more than two years, accumulating 5 million miles of field testing.