technique d'abaissement des émissions de particules

CONT: If a particulate standard of 0.37 g/km were adopted along with the proposed NO [subscript x] standard, most diesel engines could still comply but longer lead times would be necessary to develop the electronic EGR systems and particulate control techniques. It may be necessary for the largest engines to incorporate add-on particulate traps. A five-year lead time would be necessary.