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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]