Federal & State Regulations | Appendix A to Part 1054 - Summary of Previous Emission Standards

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The following standards, which EPA originally adopted under 40 CFR part 90, apply to nonroad spark-ignition engines produced before the model years specified in §1054.1:

(a) Handheld engines. Phase 1 standards apply for handheld engines as summarized in the following table starting with model year 1997:

Engine displacement class	HC	NO_X	CO
Class III	295	5.36	805
Class IV	241	5.36	805
Class V	161	5.36	603
^a Phase 1 standards are based on testing with new engines only.

Engine displacement class	HC + NO_X	CO
Class III	^a 50	805
Class IV	^b 50	805
Class V	^c 72	603
^a Class III engines had alternate HC+NO_X standards of 238, 175, and 113 for model years 2002, 2003, and 2004, respectively.
^b Class IV engines had alternate HC+NO_X standards of 196, 148, and 99 for model years 2002, 2003, and 2004, respectively.
^c Class V engines had alternate HC+NO_X standards of 143, 119, and 96 for model years 2004, 2005, and 2006, respectively.

Engine displacement class	HC + NO_X	CO
Class I	16.1	519
Class II	13.4	519
^a Phase 1 standards are based on testing with new engines only.

Engine displacement class	HC + NO_X	NMHC + NO_X	CO
Class I-A	50		610
Class I-B	40	37	610
Class I ^a	16.1	14.8	610
Class II ^b	12.1	11.3	610
^a The Phase 2 standards for Class I engines apply for new engines produced starting August 1, 2007, and for any engines belonging to an engine model whose original production date was on or after August 1, 2003.
^b Class II engines had alternate HC + NO_X standards of 18.0, 16.6, 15.0, 13.6 and alternate NMHC + NO_X standards of 16.7, 15.3, 14.0, 12.7 for model years 2001 through 2004, respectively.