Carol Browner, EPA administrator, recently signed a regulation establishing additional, more stringent NOx and NMHC standards for diesel-powered trucks and buses weighing more than 8,500 pounds, beginning with 2004 models.
By establishing emission targets in advance, EPA hopes to allow manufacturers to invest significant time and money to develop the research programs and technology needed to produce the ultralow-emitting engines. “These new standards represent the positive results that manufacturers and regulators can achieve through cooperative efforts,” said Glenn Keller, EMA executive director. “Engine manufacturers worked closely with EPA and California’s Air Resources Board to develop these standards. This coordinated approach provides a harmonized set of emission standards nationwide, and the opportunity to set emission thresholds that benefit our environment and make sense for the manufacturing community.”