&EPA
United States
Environmental Protection
Agency
Office of Transportation and Air Quality
EPA-420-B-16-022
March 2016
Nonroad Compression-Ignition Engines: Exhaust Emission Standards
Federal
Rated
Power
(kW)
kW<8
8
-------
Federal
Rated
Power
(kW)
130 900
Tier
1
2
3
4
1
2
3
4
1
2
3
4
1
2
4
1
2
4
Model
Year
1996-
2002
2003-
2005
2006-
2010
2011-
201 3 h
2014+ '
1996-
2000
2001-
2005
2006-
2010
2011-
201 3 h
2014+ '
1996-
2001
2002-
2005
2006-
2010
2011-
201 3 h
2014+ '
2000-
2005
2006-
2010
2011-
2014
2015+ ''
2000-
2005
2006-
2010
2011-
2014
2015+ ''
NMHC
(g/kW-hr)
1.3'
-
-
-
0.19
1.3'
-
-
-
0.19
1.3'
-
-
-
0.19
1.3'
-
0.40
0.19
1.3'
-
0.40
0.19
NMHC +
NOx
(g/kW-hr
-
6.6
4.0
4.0
-
-
6.4
4.0
4.0
-
-
6.4
4.0
4.0
-
-
6.4
-
-
-
6.4
-
-
NOx
(g/kW-hr
9.2
-
-
-
0.40
9.2
-
-
-
0.40
9.2
-
-
-
0.40
9.2
-
3.5
3.5 k
9.2
-
3.5 k
3.5 k
PM
(g/kW-hr
0.54
0.20
0.20
0.02
0.02
0.54
0.20
0.20
0.02
0.02
0.54
0.20
0.20
0.02
0.02
0.54
0.20
0.10
0.04'
0.54
0.20
0.10
0.04'
CO
(g/kW-hr)
11.4
3.5
3.5
3.5
3.5
11.4
3.5
3.5
3.5
3.5
11.4
3.5
3.5
3.5
3.5
11.4
3.5
3.5
3.5
11.4
3.5
3.5
3.5
Smoke a
(Percentage)
20/15/50
Useful
Life
(hours
/years) b
8,000/10
Warranty
Period
(hours
/years) b
3,000/5
Notes on following page.
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Notes:
For Tier 1, 2, and 3 standards, exhaust emissions of nitrogen
oxides (NOx), carbon monoxide (CO), hydrocarbons (HC),
and non-methane hydrocarbons (NMHC) are measured using
the procedures in 40 Code of Federal Regulations (CFR) Part
89 Subpart E. For Tier 1, 2, and 3 standards, particulate
matter (PM) exhaust emissions are measured using the
California Regulations for New 1996 and Later Heavy-Duty
Off-Road Diesel Cycle Engines.
For Tier 4 standards, engines are tested for transient and
steady-state exhaust emissions using the procedures in 40
CFR Part 1039 Subpart F. Transient standards do not apply to
engines below 37 kilowatts (kW) before the 2013 model year,
constant-speed engines, engines certified to Option 1, and
engines above 560 kW.
Tier 2 and later model naturally aspirated nonroad engines
shall not discharge crankcase emissions into the atmosphere
unless these emissions are permanently routed into the
exhaust. This prohibition does not apply to engines using
turbochargers, pumps, blowers, or superchargers.
In lieu of the Tier 1, 2, and 3 standards for NOX, NMHC +
NOX, and PM, manufacturers may elect to participate in the
averaging, banking, and trading (ABT) program described in
40 CFR Part 89 Subpart C.
Smoke emissions may not exceed 20 percent during the
acceleration mode, 15 percent during the lugging mode, and
50 percent during the peaks in either mode. Smoke emission
standards do not apply to single-cylinder engines, constant-
speed engines, or engines certified to a PM emission stan-
dard of 0.07 grams per kilowatt-hour (g/kW-hr) or lower.
Smoke emissions are measured using procedures in 40 CFR
Part 86 Subpart I.
Useful life and warranty period are expressed hours and
years, whichever comes first.
Hand-startable air-cooled direct injection engines may option-
ally meet a PM standard of 0.60 g/kW-hr. These engines may
optionally meet Tier 2 standards through the 2009 model
years. In 2010 these engines are required to meet a PM
standard of 0.60 g/kW-hr.
Useful life for constant speed engines with rated speed 3,000
revolutions per minute (rpm) or higher is 5 years or 3,000
hours, whichever comes first.
e Warranty period for constant speed engines with rated speed
3,000 rpm or higher is 2 years or 1,500 hours, whichever
comes first.
f These Tier 3 standards apply only to manufacturers selecting
Tier 4 Option 2. Manufacturers selecting Tier 4 Option 1 will
be meeting those standards in lieu of Tier 3 standards.
g A manufacturer may certify all their engines to either Option 1
or Option 2 sets of standards starting in the indicated model
year. Manufacturers selecting Option 2 must meet Tier 3
standards in the 2008-2011 model years.
h These standards are phase-out standards. Not more than 50
percent of a manufacturer's engine production is allowed to
meet these standards in each model year of the phase out
period. Engines not meeting these standards must meet the
final Tier 4 standards.
i These standards are phased in during the indicated years.
At least 50 percent of a manufacturer's engine production
must meet these standards during each year of the phase in.
Engines not meeting these standards must meet the
applicable phase-out standards.
j For Tier 1 engines the standard is for total hydrocarbons.
k The NOx standard for generator sets is 0.67 g/kW-hr.
I The PM standard for generator sets is 0.03 g/kW-hr.
Citations: Code of Federal Regulations (CFR) citations:
40 CFR 89.112 = Exhaust emission standards
40 CFR 1039.101 = Exhaust emission standards for after
2014 model year
40 CFR 1039.102 = Exhaust emission standards for model
year 2014 and earlier
40 CFR 1039 Subpart F = Exhaust emissions transient and
steady state test procedures
40 CFR 86 Subpart I = Smoke emission test procedures
40 CFR 1065 = Test equipment and emissions measurement
procedures
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