### Question
How does EMISSION STANDARDS FOR MOVING SOURCES 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 85-AIR POLLUTION PREVENTION AND CONTROL > SUBCHAPTER II-EMISSION STANDARDS FOR MOVING SOURCES > Part A-Motor Vehicle Emission and Fuel Standards**

