### Question
How is the "clean alternative fuel" defined?


### Answer
The term **clean alternative fuel** is defined in *42 U.S.C. § 7581* as follows -

> only a fuel with respect to which such vehicle was certified as a clean-fuel vehicle meeting the standards applicable to clean-fuel vehicles under section 7583(d)(2) of this title when operating on clean alternative fuel (or any CARB standards which replaces such standards pursuant to section 7583(e) of this title)

#### Citation:
  - *42 U.S.C. § 7581*
  - Heading: **SUBCHAPTER I-PROGRAMS AND ACTIVITIES > Subchapter Referred to in Other Sections > Part Referred to in Other Sections**

