['Air Programs']
['Air Emissions']
03/22/2023
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The following standards, which EPA originally adopted under 40 CFR part 89, apply to nonroad compression-ignition engines produced before the model years specified in §1039.1:
(a) Tier 1 standards apply as summarized in the following table:
| Rated power (kW) | Starting model year | NO X | HC | NO X NMHC | CO | PM |
|---|---|---|---|---|---|---|
| kW< 8 | 2000 | 10.5 | 8.0 | 1.0 | ||
| 8 ≤ kW < 19 | 2000 | 9.5 | 6.6 | 0.80 | ||
| 19 ≤ kW < 37 | 1999 | 9.5 | 5.5 | 0.80 | ||
| 37 ≤ kW < 75 | 1998 | 9.2 | ||||
| 75 ≤ kW < 130 | 1997 | 9.2 | ||||
| 130 ≤ kW ≤ 560 | 1996 | 9.2 | 1.3 | 11.4 | 0.54 | |
| kW > 560 | 2000 | 9.2 | 1.3 | 11.4 | 0.54 |
(b) Tier 2 standards apply as summarized in the following table:
| Rated power (kW) | Starting model year | NO X NMHC | CO | PM |
|---|---|---|---|---|
| kW< 8 | 2005 | 7.5 | 8.0 | 0.80 |
| 8 ≤ kW < 19 | 2005 | 7.5 | 6.6 | 0.80 |
| 19 ≤ kW < 37 | 2004 | 7.5 | 5.5 | 0.60 |
| 37 ≤ kW < 75 | 2004 | 7.5 | 5.0 | 0.40 |
| 75 ≤ kW < 130 | 2003 | 6.6 | 5.0 | 0.30 |
| 130 ≤ kW < 225 | 2003 | 6.6 | 3.5 | 0.20 |
| 225 ≤ kW < 450 | 2001 | 6.4 | 3.5 | 0.20 |
| 450 ≤ kW ≤ 560 | 2002 | 6.4 | 3.5 | 0.20 |
| kW > 560 | 2006 | 6.4 | 3.5 | 0.20 |
(c) Tier 3 standards apply as summarized in the following table:
| Rated power (kW) | Starting model year | NOX NMHC | CO | PM |
|---|---|---|---|---|
| 37 ≤ kW < 75 | 2008 | 4.7 | 5.0 | 0.40 |
| 75 ≤ kW < 130 | 2007 | 4.0 | 5.0 | 0.30 |
| 130 ≤ kW ≤ 560 | 2006 | 4.0 | 3.5 | 0.20 |
(d) Tier 1 through Tier 3 standards applied only for discrete-mode steady-state testing. There were no not-to-exceed standards or transient testing.
[86 FR 34507, Jun. 29, 2021; 88 FR 4660, Jan. 24, 2023]
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