(a) You must show that engines meet the following exhaust emission standards:

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(1) Criteria pollutant standards for NOX, HC, PM, and CO apply as described in § 1036.104.

(2) Greenhouse gas (GHG) standards for CO2, CH4, and N2O apply as described in § 1036.108.

(b) You may optionally demonstrate compliance with the emission standards of this part by testing hybrid engines and hybrid powertrains, rather than testing the engine alone. Except as specified, provisions of this part that reference engines apply equally to hybrid engines and hybrid powertrains.