oEPA
United States
Environmental Protection
Agency
Office of Transportation and Air Quality
EPA-420-B-16-017
March 2016
Heavy-Duty Highway Engine: Clean Fuel Fleet Exhaust Emission Standards
Federal a
Emissions Category
LEV (Federal Fuel)
LEV (California Fuel)
ILEV
ULEV
ZEV
NMHC+NOx
(g/bhp-hr)
3.8
3.5
2.5
2.5
0
CO
(g/bhp-hr)
b
b
14.4
7.2
0
PM
(g/bhp-hr)
b
b
0.10
0.05
0
Formaldehyde
(g/bhp-hr)
b
b
0.05
0.025
0
Notes:
a These standards have in effect been super-
seded by newer, more stringent standards
in 40 Code of Federal Regulations (CFR)
Part 86. See EPA manufacturer guidance
letter on Clean-Fuel Vehicle Standards
(CCD-05-12, July 21, 2005, 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.
Code of Federal Regulations (CFR) citations:
40 CFR 88.105-94 - Clean-fuel fleet emis-
sion standards for heavy-duty engines
• 40 CFR 88.311-93 & 88.311-98-Emis-
sion standards for Inherently Low-Emission
Vehicles
40 CFR 86 Subpart N - The test procedure
for the Clean Fuel Fleet standards is the
EPA Transient Test Procedure
------- |