Jump to main content or area navigation.

Contact Us

Emission Standards Reference Guide

Marine Spark-Ignition Engines and Vessels -- Exhaust Emission Standards

Engine Type Model Year HC + NOxa
(g/KW-hr)
COC
(g/KW-hr)
Useful Life (hours/years)d Warranty Period (hours/years)d
P ≤ 4.3 kWb P > 4.3 kWb P ≤ 4.3 kWb P > 4.3 kWb
Federale Personal Watercraft & Outboard Marine Engines 1998 278
[ABT]
(0.917 x (151 + 557/P0.9 + 2.44)
[ABT]
- - 350 / 5 All Emission-related Components: 1 yearf
1999 253
[ABT]
(0.833 x (151 + 557/P0.9 + 2.89)
[ABT]
- -
2000 228
[ABT]
(0.750 x (151 + 557/P0.9) + 3.33
[ABT]
- -
2001 204
[ABT]
(0.667 x (151 + 557/P0.9) + 3.78
[ABT]
- - All Emission-related Components: 1 year
Specified Major Emission
Control Components: 200 / 3
2002 179
[ABT]
(0.583 x (151 + 557/P0.9) + 4.22
[ABT]
- -
2003 155
[ABT]
(0.500 x (151 + 557/P0.9) + 4.67
[ABT]
- -
2004 130
[ABT]
(0.417 x (151 + 557/P0.9) + 5.11
[ABT]
- - All Emission-related Components: 200 / 2
Specified Major Emission
Control Components: 200 / 3
2005 105
[ABT]
(0.333 x (151 + 557/P0.9) + 5.56
[ABT]
- -
2006-2009 81
[ABT]
(0.250 x (151 + 557/P0.9) + 6.00
[ABT]
- -
2010 +g 30.0
[ABT]
2.1 + 0.09 x (151 + 557/P0.9)
[ABT]
500 - 5.0 x P 300 Personal Watercraft: 350 / 5h
Outboard: 350 / 10h
Personal Watercraft: 175 hours or 30 months
Outboard Engines: 175 / 5
Sterndrive / Inboard Engines Conventional Enginesg 2010 + 5.0
[ABT]
75.0
[ABT]
480 / 10i Electrical & Mechanical Components:
480/3
High-Performance Engines P ≤ kWb P > 485 kWb 350 P ≤ 485 kW: 150 / 3
P > 485 kW: 50 / 1
Electrical Components: 480 / 3
Mechanical Components: P ≤ 485 kW: 150 / 3
P > 485 kW: 50 / 1
2010 20.0 25.0
2011+ 16.0 22.0

 

Notes:

a  The numerical emission standards for hydrocarbons (HC) must be met based on the following types of HC emissions for engines powered by the following fuels: (1) total hydrocarbon equivalent for alcohol; (2) non-methane hydrocarbon for natural gas; and (3) total hydrocarbons for other fuels.

b  P stands for the maximum engine power in kilowatts.

c  Manufacturers may generate or use emission credits for averaging, but not for banking or trading.

d  Useful life and warranty period are expressed hours or years of operation (unless otherwise indicated), whichever comes first.

e  The test procedure for federal standards uses the International Organization for Standardization (ISO) 8178 E4 5-Mode Steady-State Test Cycle.

f  Also applies to model year (MY) 1997 engine families certified pursuant to 40 Code of Federal Regulations (CFR) 91.205.

g  Not-to-exceed emission standards specified in 40 CFR 1045.107 also apply.

h  A longer useful life in terms of hours must be specified for the engine family if the average service life is longer than the minimum value as described in 40 CFR 1045.103(e)(3).

i  The useful life may not be shorter than: (1) 150 hours of operation; (2) the recommended overhaul interval; or (3) the engine's mechanical warranty. A longer useful life must be specified in terms of hours if the average service life is longer than the minimum value as described in 40 CFR 1045.105(e)(3).

Code of Federal Regulations (CFR) Citations:
  • 40 CFR 91.104 = Outboard and personal watercraft (PWC) exhaust emission standards (1998-2009)
  • 40 CFR 91.105 = Outboard and PWC useful life (1998-2009)
  • 40 CFR 91.1203 = Warranty period (1998-2009)
  • 40 CFR 1045.103 = Outboard and PWC exhaust emission standards (2010+)
  • 40 CFR 1045.105 = Sterndrive/Inboard exhaust emission standards
  • 40 CFR 1045.107 = Not-to-exceed exhaust emission standards
  • 40 CFR 1045.120 = Warranty requirements (2010+)

top of page

This page is maintained by EPA's Office of Transportation and Air Quality (OTAQ).
For more: About Us | Get E-mail Updates | Browse the A to Z Subject Index.

Jump to main content.