40 CFR Part 1039, Appendix I — Summary of Previous Emission Standards
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
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 | NOX | HC | NOX + NMHC | CO | PM |
|---|---|---|---|---|---|---|
| kW< 8 | 2000 | | | 10.5 | 8 | 1 | |
| 8 ≤ kW < 19 | 2000 | | | 9.5 | 6.6 | 0.8 | |
| 19 ≤ kW < 37 | 1999 | | | 9.5 | 5.5 | 0.8 | |
| 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 | NOX + NMHC | CO | PM |
|---|---|---|---|---|
| kW< 8 | 2005 | 7.5 | 8 | 0.8 |
| 8 ≤ kW < 19 | 2005 | 7.5 | 6.6 | 0.8 |
| 19 ≤ kW < 37 | 2004 | 7.5 | 5.5 | 0.6 |
| 37 ≤ kW < 75 | 2004 | 7.5 | 5 | 0.4 |
| 75 ≤ kW < 130 | 2003 | 6.6 | 5 | 0.3 |
| 130 ≤ kW < 225 | 2003 | 6.6 | 3.5 | 0.2 |
| 225 ≤ kW < 450 | 2001 | 6.4 | 3.5 | 0.2 |
| 450 ≤ kW ≤ 560 | 2002 | 6.4 | 3.5 | 0.2 |
| kW > 560 | 2006 | 6.4 | 3.5 | 0.2 |
(c) Tier 3 standards apply as summarized in the following table:
| Rated power(kW) | Startingmodel year | NOX+NMHC | CO | PM |
|---|---|---|---|---|
| 37 ≤ kW < 75 | 2008 | 4.7 | 5 | 0.4 |
| 75 ≤ kW < 130 | 2007 | 4 | 5 | 0.3 |
| 130 ≤ kW ≤ 560 | 2006 | 4 | 3.5 | 0.2 |
(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, June 29, 2021, as amended at 88 FR 4660, Jan. 24, 2023]