EXHAUST EMISSIONS LEGISLATION 2004-2017 (US EPA)

Emissions shown on the table are the United States Government emissions standards. These standards are always evolving and can change based on location. For example California has stricter standards in some areas and air quality boards in California are known to push for the strictest interpretations. Generally if no company manufacturers equipment that meets the current standards your air quality regulators may allow the last version of equipment available. Check with you local air quality jurisdiction to see what is required in your area.

U.S. EPA Non-Road and Stationary Emissions Regulations

kWm	(HP)	2004	2005	2006	2007	2008	2011	2012	2013	2014	2015
0 ≤ P < 8	(0 - 11)	Tier 1	(7.5) / 8.0 / 0.80			(7.5) / 6.6 / 0.40
8 ≤ P < 19	(11 - 25)	Tier 1	(7.5) / 6.6 / 0.80			(7.5) / 6.6 / 0.40
19 ≤ P < 37	(25 - 50)	(7.5) / 5.5 / 0.60				(7.5) / 5.0 / 0.30			(4.7) / 5.0 / 0.03
37 ≤ P < 56	(50 - 75)	(7.5) / 5.0 / 0.40				(4.7) / 5.0 / 0.30 [ EPA Option 1 ]			(4.7) / 5.0 / 0.03
56 ≤ P < 75	(75 - 100)	(7.5) / 5.0 / 0.40				(4.7) / 5.0 / 0.40		3.3 / 0.19 / 5.0 / 0.02			0.40 / 0.19 / 5.0 / 0.02
75 ≤ P < 130	(100 - 174)	(6.6) / 5.0 / 0.30			(4.0) / 5.0 / 0.30			3.3 / 0.19 / 5.0 / 0.02			0.40 / 0.19 / 5.0 / 0.02
130 ≤ P < 225	(174 - 302)	(6.6) / 3.5 / 0.20		(4.0) / 3.5 / 0.20			2.0 / 0.19 / 3.5 / 0.02			0.40 / 0.19 / 3.5 / 0.02
225 ≤ P < 450	(302 - 603)	Tier 2	(4.0) / 3.5 / 0.20
450 ≤ P < 560	(603 - 750)	Tier 2	(4.0) / 3.5 / 0.20
560 ≤ P < 900	(750 - 1206)	9.2 / 1.3 / 11.4 / 0.54		(6.4) / 3.5 / 0.20			3.5 / 0.40 / 3.5 / 0.10				0.67 / 0.19 / 3.5 / 0.03 3.5 / 0.19 / 3.5 / 0.04 (Non Generator)
> 900	(>1206)	9.2 / 1.3 / 11.4 / 0.54		(6.4) / 3.5 / 0.20			0.67 / 0.40 / 3.5 / 0.10

TIER 1

TIER 2

TIER 3

TIER 4 (Interim)

TIER 4 (Final)

NO_x / HC / CO / PM (g/kW-hr)
(NO_x + HC) / CO / PM (g/kW-hr)
[Conversion: (g/kW-hr X 0.7457 = g/bhp-hr)]
Separate NO_x and HC standards separated by a forward slash.
Combined NO_x and HC standards enclosed by parentheses. "( )"

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