Summary of Previous Emission Standards

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. (1) Phase 1 standards apply for handheld engines as summarized in the following table starting with model year 1997: Table 1 to Appendix I—Phase 1 Emission Standards for Handheld Engines [g/kW-hr] a 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. (2) Phase 2 standards apply for handheld engines as summarized in the following table starting with model year 2002 for Class III and Class IV, and starting in model year 2004 for Class V: Table 2 to Appendix I—Phase 2 Emission Standards for Handheld Engines [g/kW-hr] 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. (b) Nonhandheld engines. (1) Phase 1 standards apply for nonhandheld engines as summarized in the following table starting with model year 1997: Table 3 to Appendix I—Phase 1 Emission Standards for Nonhandheld Engines [g/kW-hr] a 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. (2) Phase 2 standards apply for nonhandheld engines as summarized in the following table starting with model year 2001 (except as noted for Class I engines): Table 4 to Appendix I—Phase 2 Emission Standards for Nonhandheld Engines [g/kW-hr] 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. (3) Note that engines subject to Phase 1 standards were not subject to useful life, deterioration factor, production-line testing, or in-use testing provisions. In addition, engines subject to Phase 1 standards and engines subject to Phase 2 standards were both not subject to the following provisions: (i) Evaporative emission standards as specified in §§ 1054.110 and 1054.112. (ii) Altitude adjustments as specified in § 1054.115(c). (iii) Warranty assurance provisions as specified in § 1054.120(f). (iv) Emission-related installation instructions as specified in § 1054.130. (v) Bonding requirements as specified in § 1054.690. [86 FR 34526, June 29, 2021. Redesignated and amended at 88 FR 4668, Jan. 24, 2023]