Emission Standards Reference Guide
Heavy-Duty Highway Engine -- Clean Fuel Fleet Exhaust Emission Standards
|Emissions Category|| NMHC+NOx
|Federal a||LEV (Federal Fuel)||3.8||b||b||b|
|LEV (California Fuel)||3.5||b||b||b|
a These standards have in effect been superseded by newer, more stringent standards in 40 Code of Federal Regulations (CFR) Part 86. See EPA manufacturer guidance letter on Clean-Fuel Vehicle Standards (PDF) (6 pp, 109K, CCD-05-12, July 21, 2005, About PDF) which provides guidance on determining the equivalency of vehicle and engine emission standards in the CFR Part 86 standards and Part 88 standards for Clean-Fuel Vehicles.
b Exhaust emissions from engines used in heavy-duty low emission vehicles shall meet conventional vehicle standards set forth in Part 86 for total hydrocarbon, carbon monoxide, particulate, and organic material hydrocarbon equivalent.