§7585 Standards for heavy-duty clean-fuel vehicles (GVWR above 8,500 up to 26,000 lbs.)

Summary

Requires heavy-duty clean-fuel vehicles or engines made for model year 1998 or later and weighing more than 8,500 pounds up to 26,000 pounds to meet a combined NOx and NMHC emissions limit of 3.15 grams per brake-horsepower-hour. That 3.15 g/bhp-hr is a 50% cut compared to the combined limit that applied to a conventional 1994 heavy-duty diesel vehicle. No rule under this part applies to vehicles over 26,000 pounds. The Administrator may set a less strict limit for clean diesel vehicles if a 50% cut is not technically possible when considering durability, costs, time to prepare, safety, and other factors. The Administrator must decide on feasibility by December 31, 1993. Anyone can ask the Administrator for that decision at any time, and the Administrator must respond within six months. Any weaker standard must still require at least a 30% reduction.