40 CFR — Protection of Environment
Appendix I to Part 1039—Summary of Previous Emission Standards
United States · 40 CFR — Protection of Environment · Status: effective
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- Citation
- 40 CFR — Protection of Environment, Appendix I to Part 1039—Summary of Previous Emission Standards, United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/195151
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Full text
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:
Table 1 to Appendix I—Tier 1 Emission Standards
[g/kW-hr]
(b) Tier 2 standards apply as summarized in the following table:
Table 2 to Appendix I—Tier 2 Emission Standards
[g/kW-hr]
(c) Tier 3 standards apply as summarized in the following table:
Table 3 to Appendix I—Tier 3 Emission Standards
[g/kW-hr]
(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.
Legislative history
This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.