United States
Environmental Protection
kl *m Agency
Office of Transportation and Air Quality
EPA-420-F-20-010
February 2020
How to Identify Low NOx Certified Engines
Diesel Emissions Reduction Act (DERA) Grants Fact Sheet
In 2013, the California Air Resources Board (CARB) established optional low NOx standards for heavy-
duty engines. There are currently three low NOx standards that an engine can be certified by CARB to
meet: 0.02 g/bhp-hr, 0.05 g/bhp-hr, or 0.10 g/bhp-hr. Under the DERA program, a replacement vehicle
whose engine is certified to meet a CARB low NOx standard can be funded at 35% (compared to the
25% funding for a replacement vehicle whose engine meets the EPA NOx emission standard, which is
0.20 g/bhp-hr). In some cases, engines may test at emission levels below the Optional Low NOx
Emission Standards, but they are not certified by CARB to meet the low NOx standard. In these cases,
EPA will only provide funding at 25% for a replacement vehicle.
There are currently no diesel fueled engines certified to meet the low NOx standard; all low NOx
certified engines are natural gas or liquified petroleum gas (propane) fueled engines. However, not all
new natural gas or propane engines are certified to the low NOx standard.
To determine if an engine has been certified by CARB to meet the Optional Low NOx Emission
Standards, you must look at the CARB Executive Order (EO) certifying that engine. Halfway down the
first page, there should be a table with information about the emissions levels the engine tested at and
the emissions levels the engine is certified to. The example below demonstrates an engine certified to
meet the Optional Low NOx Emission Standards.
in
g/bhp-hr
NMHC
NOx
NMHC+NOx
CO
PM
KCHO
FTP
SET
FTP
SET
FTP
SET
FTP
SET
FTP
SET
FTP
SET
STD
0.14
0.14
0.02
0.02
•
•
15.5
15.5
0.01
0.01
•
•
CERT
0.004
0.000
0.01
0.000
•
•
1.5
0.3
0.01
0.000
•
•
NTE
0.21
0.03
•
19.4
0.02
•
4 g/bhp-*ir=^
FEL=family en
jr ams per braKe horsepower-b
lission limit. CERT=certificati
our, FTP=Federa) Test Proa
on level; NMHC/HC=noo-me
KJure; SET= Supplemental emissions testing; NTE=Not-to-Exceed; STD=standard or emission test cap.
thane/hydrocarbon. NOx=oxides of nitrogen. CO=carbon monoxide, PM=particulate matter, HCHO=formaldenyde
BE IT FURTHER RESOLVED: That the listed engine family is certified to the Optional Low NOx Emission Standards as
specified in 13 CCR 1956.8(a)(2)(A) and section 11.B.7 of the incorporated "California Exhaust Emission Standards and
Test Procedures for 2004 and Subsequent Model Heavy Duty Diesel-Engines and Vehicles" adopted December 12,
2002, as last amended September 1, 2017.
The highlighted box in the NOx-FTP column and STD row in the table above lists the NOx standard to
which the engine is certified. If the number matches one of the three low NOx standards (0.02 g/bhp-hr,
0.05 g/bhp-hr, or 0.10 g/bhp-hr) then it is certified to the low NOx standard. The EO for a low NOx-
certified engine will also state under the table that the engine is certified to the low NOx standard
(highlighted above).
It is important to note that some engines may test at emission levels at or below the low NOx standards
but are NOT certified to meet the low NOx standards. The example below demonstrates an engine
certified to meet EPA's NOx emission standard of 0.20 (represented in box in the NOx-FTP column and
STD row), even though the engine tested at emission levels below the Optional Low NOx Emission
Standards (represented in the box in the NOx-FTP column and CERT row). The standard that the engine
is certified to is always listed in the STD row, FTP column. Further, the paragraph below the table does
not specifically state that this engine has been certified to the Optional Low NOx Emission Standards.

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in
g/bhp-hr
NMHC
NOx
NMHC+NOx
CO
PM
HCHO
FTP
sex
FTP
SET
FTP
SET
FTP
SET
FTP
SET
FTP
SET
STD
0.14
0.14
0.20
0.20
•
•
15.5
15.5
0.01
0.01
*
-
CERT
0.0004
0.001
0.06
0.05
•
•
0.1
0.00
0.0001
0.0002
•
•
NTE
0.21
0.30
*
19.4
0.02
•
4 Q/bhp-ft
FEL=family err
jmma par brake horeapow»-r*xir. FTP=redaral ThI Procedure, St T-Supplemental emmiont IMIing; NTE-Nol-to-Excaed, STTXIarOard or emieaion teal cap,
ission limit CE»T=e®1rf>cation lavsl. NMHQHC=rwti-mettwwffiyon; NOi-oxidat of nitrogen, CO-carDon monoxide: PM^articulate matter. HCHCWormaldahydi!
BE it FURTHER RESOLVED: The manufacturer has demonstrated compliance with the Greenhouse Gas Emission
Standards as specified in Title 13 CCR 1956.8 and the incorporated "California Exhaust Emission Standards and Test
Procedures for 2004 and Subsequent Model Heavy Duty Diesel-Engines and Vehicles" (HDDE Test Procedures)
adopted December 12, 2002, as last amended September 1, 2017 using the 2014 model year National Heavy-Duty
Engine and Vehicle Greenhouse Gas Program as specified in Section 1036.108 of the HDDE Test Procedures. The
manufacturer has submitted the required information and therefore has met the criteria necessary to receive a California
Executive Order based on the Environmental Protection Agency's Certificate of Conformity for the above listed engine
family.
For your convenience, below is a list of engines certified by CARB to meet the Optional Low NOx
Emission Standards as of the date of this factsheet. We will update this list periodically; however, you
should reference CARETs Executive Order (EO listing for the most complete and up to date
information.
Heavy Duty Engines Certified to Meet CARB's Optional Low NOx Emission Standards
Low NOx Engine
Engine Family
Displacement
NOx Certification
Standard
NOx
Reduction
Fuel
Intended
Service Class


(Liters)

(g/bhp-hr)
%


2020 EOs







Cummins 6.7
LCEXH0408BBC
6.7
0.02

90%
NG
MHDD
Cummins 8.9
LCEXH0540LBN
8.9
0.02

90%
NG
HHDD
Cummins 8.9
LCEXH0540LBL
8.9
0.02

90%
NG
MHDD
Cummins 8.9
LCEXH0540LBM
8.9
0.02

90%
NG
UB
Cummins 11.9
LCEXH0729XBC
11.9
0.02

90%
NG
HHDD-UB
Roush (LPG) 6.8
LRIIE06.8BW2
6.8
0.02

90%
LPG
HDO
Roush (LPG) 6.8
LRIIE06.8BWL
6.8
0.05

75%
LPG
HDD
2019 EOs







Aailitv Powertrains 6.8
KAGIE06.8BW6
6.8
0.02

90%
NG
HDO
Aailitv Powertrains 6.8
KAGIEQ6.8BWZ
6.8
0.02

90%
NG
HDO
Aailitv Powertrains 6
KAGIE06.0584
6.0
0.05

75%
NG
HDO
Cummins 8.9
KCEXH0540LBL
8.9
0.02

90%
NG
MHDD
Cummins 11.9
KCEXH0729XBC
11.9
0.02

90%
NG
HHDD-UB
Cummins 6.7
KCEXH0408BBB
6.7
0.10

50%
NG
MHDD
Encore Tec 6.8
KEL3E06.8BWZ
6.8
0.02

90%
NG
HDO
Encore Tec 6.8
KEL3E06.8BW6
6.8
0.02

90%
NG
HDO
Encore Tec 6
KEL3E06.0584
6.0
0.05

75%
NG
HDO
Roush (CNG) 6.8
KRIIE06.8BC2
6.8
0.02

90%
NG
HDO
Roush (CNG) 6.8
KRIIE06.8BC1
6.8
0.10

50%
NG
HDO
Roush (LPG) 6.8
KRIIE06.8BW2
6.8
0.02

90%
LPG
HDO
Roush (LPG) 6.8
KRIIE06.8BWL
6.8
0.05

75%
LPG
HDO
2018 EOs







Aailitv Powertrains 6
JAGIE06.0584
6.0
0.05

75%
NG
HDO
Cummins 6.7
JCEXH0408BBB
6.7
0.10

50%
NG
MHDD
Cummins 8.9
JCEXH0540LBN
8.9
0.02

90%
NG
HHDD
Cummins 8.9
JCEXH0540LBL
8.9
0.02

90%
NG
MHDD
Cummins 8.9
JCEXH0540LBM
8.9
0.02

90%
NG
UB
Cummins 11.9
JCEXH0729XBC
11.9
0.02

90%
NG
HHDD-UB
Encore Tec 6
JEL3E06.0584
6.0
0.05

75%
NG
HDO
Encore Tec 6.8
JEL3E06.8BWZ
6.8
0.02

90%
NG
HDO
Encore Tec 6.8
JEL3E06.8BW6
6.8
0.02

90%
NG
HDO
Roush (LPG) 6.8
JRIIE06.8BWL
6.8
0.05

75%
LPG
HDO
Roush (LPG) 6.8
JRIIE06.8BW2
6.8
0.02

90%
LPG
HDO

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Low NOx Engine
Engine Family
Displacement
(Liters)
NOx Certification
Standard
(g/bhp-hr)
NOx
Reduction
%
Fuel
Intended
Service Class
2017 EOs






Cummins 8.9
HCEXH0540LBK
8.9
0.02
90%
NG
HHDD
Cummins 8.9
HCEXH0540LBJ
8.9
0.02
90%
NG
MHDD
Cummins 8.9
HCEXH0540LBI
8.9
0.02
90%
NG
UB
Cummins 6.7
HCEXHO408BBA
6.7
0.10
50%
NG
MHDD
Encore Tec 6.8
HEL3E06.8BWZ
6.8
0.02
90%
NG
HDO
Encore Tec 6
HEL3E06.076P
6.0
0.05
75%
NG
HDO
GreenKraft (LPG) 8
HGKTE08.0GL8
8.0
0.02
90%
LPG
HDO
GreenKraft (CNG) 8
HGKTE08.0GC8
8.0
0.02
90%
NG
HDO
Roush (LPG) 6.8
HRIIE06.8BWL
6.8
0.05
75%
LPG
HDO
Roush (CNG) 6.8
HRIIE06.8BWC
6.8
0.10
50%
NG
HDO
Westoort Dallas 6.8
HBAFE06.8BW6
6.8
0.05
75%
NG
HDO
2016 EOs






Cummins 8.9
GCEXH0540LBJ
8.9
0.02
90%
NG
MHDD
Roush 6.8
GRIIE06.8BWC
6.8
0.10
50%
NG
HDO
UB - Urban Bus	MHDD - Medium-Heavy Duty Diesel Cycle NG - Natural Gas
HDO - Heavy-Duty Otto-Cycle HHDD - Heavy-Heavy Duty Diesel Cycle	LPG - Liquefied Petroleum Gas

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