40 CFR Appendix I Summary of Previous Emission Standards | Code of Federal Regulations | US Law

40 CFR Appendix I

Summary of Previous Emission Standards

June 9, 2020

CFR

The following standards apply to nonroad spark-ignition engines produced before the model years specified in §1054.1:

(a) Handheld engines. Phase 1 and Phase 2 standards apply for handheld engines as specified in 40 CFR 90.103 and summarized in the following tables:

Table 1 to Appendix I—Phase 1 Emission Standards for Handheld Engines (g/kW-hr)^a

Open Table

Engine displacement class	HC	NOX	CO
Class III	295	5.36	805
Class IV	241	5.36	805
Class V	161	5.36	603

^aPhase 1 standards are based on testing with new engines only.

Table 2 to Appendix I—Phase 2 Emission Standards for Handheld Engines (g/kW-hr)^a

Open Table

Engine displacement class	HC + NOX	CO
Class III	50	805
Class IV	50	805
Class V	72	603

^aThe standards shown are the fully phased-in standards. See 40 CFR 90.103 for standards that applied during the phase-in period.

(b) Nonhandheld engines. Phase 1 and Phase 2 standards apply for nonhandheld engines as specified in 40 CFR 90.103 and summarized in the following tables:

Table 3 to Appendix I—Phase 1 Emission Standards for Nonhandheld Engines (g/kW-hr)^a

Open Table

Engine displacement class	HC + NOX	CO
Class I	16.1	519
Class II	13.4	519

^aPhase 1 standards are based on testing with new engines only.

Table 4 to Appendix I—Phase 2 Emission Standards for Nonhandheld Engines (g/kW-hr)

Open Table

Engine displacement class	HC + NOX	NMHC + NOX	CO
Class I-A	50		610
Class I-B	40	37	610
Class I	16.1	14.8	610
Class II^a	12.1	11.3	610

^aThe Class II standards shown are the fully phased-in standards. See 40 CFR 90.103 for standards that applied during the phase-in period.

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