### Question
How is the term refrigerant defined?


### Answer
The term **refrigerant** is defined in *42 U.S.C. § 7671h* as the following:

> any class I or class II substance used in a motor vehicle air conditioner

#### Citation:
  - *42 U.S.C. § 7671h*
  - Heading: **CHAPTER 85-AIR POLLUTION PREVENTION AND CONTROL > SUBCHAPTER VI-STRATOSPHERIC OZONE PROTECTION**

