Title 42, The Public Health and WelfareRelease 119-110

§7585 Standards for Heavy-duty Clean-fuel Vehicles (gvwr Above 8,500 up to 26,000 Lbs.)

Title 42 › CHAPTER 85 — AIR POLLUTION PREVENTION AND CONTROL › SUBCHAPTER II — EMISSION STANDARDS FOR MOVING SOURCES › Part C — Clean Fuel Vehicles › § 7585

Last updated Sep 22, 2026|Official source

Summary

For model years 1998 and later, clean-fuel heavy-duty vehicles and engines with a gross vehicle weight rating over 8,500 pounds and up to 26,000 pounds must keep combined NOx and NMHC emissions at or below 3.15 grams per brake-horsepower hour. No standard is set here for vehicles over 26,000 pounds. The Administrator can allow a less strict limit if a 50 percent cut is not technically possible for clean diesel, taking into account durability, cost, lead time, safety, and other factors. The Administrator must decide on this before December 31, 1993, and must act on any petition within 6 months. Any weaker standard must still require at least a 30 percent reduction.

Full Legal Text

Title 42, §7585

The Public Health and Welfare, Source: USLM XML via OLRC

(a)Model years after 1997; combined NOx and NMHC standard

For classes or categories of heavy-duty vehicles or engines manufactured for the model year 1998 or thereafter and having a GVWR greater than 8,500 lbs. and up to 26,000 lbs. GVWR, the standards under this part for clean-fuel vehicles shall require that combined emissions of oxides of nitrogen (NOx) and nonmethane hydrocarbons (NMHC) shall not exceed 3.15 grams per brake horsepower hour (equivalent to 50 percent of the combined emission standards applicable under section 7521 of this title for such air pollutants in the case of a conventional model year 1994 heavy-duty diesel-fueled vehicle or engine). No standard shall be promulgated as provided in this section for any heavy-duty vehicle of more than 26,000 lbs. GVWR.

(b)Revised standards that are less stringent

(1)The Administrator may promulgate a revised less stringent standard for the vehicles or engines referred to in subsection (a) if the Administrator determines that the 50 percent reduction required under subsection (a) is not technologically feasible for clean diesel-fueled vehicles and engines, taking into account durability, costs, lead time, safety, and other relevant factors. To provide adequate lead time the Administrator shall make a determination with regard to the technological feasibility of such 50 percent reduction before December 31, 1993.

(2)Any person may at any time petition the Administrator to make a determination under paragraph (1). The Administrator shall act on such a petition within 6 months after the petition is filed.

(3)Any revised less stringent standards promulgated as provided in this subsection shall require at least a 30 percent reduction in lieu of the 50 percent reduction referred to in paragraph (1).

Reference

Citations & Metadata

Citation

42 U.S.C. § 7585

Title 42, The Public Health and Welfare

Last Updated

Sep 22, 2026

Release point: 119-110