### Question
How does Motor Vehicle Emission and Fuel Standards define model year?


### Answer
Under *42 U.S.C. § 7521*, **model year** is defined as:

> the calendar year.

#### Citation:
  - *42 U.S.C. § 7521*
  - Heading: **CHAPTER 83-ENERGY EXTENSION SERVICE > SUBCHAPTER II-EMISSION STANDARDS FOR MOVING SOURCES > Part A-Motor Vehicle Emission and Fuel Standards**

