### Question
How is the term existing OCS source defined?


### Answer
The term **existing OCS source** is defined in *42 U.S.C. § 7627* as the following:

> any OCS source other than a new OCS source

#### Citation:
  - *42 U.S.C. § 7627*
  - Heading: **CHAPTER 85-AIR POLLUTION PREVENTION AND CONTROL > SUBCHAPTER III-GENERAL PROVISIONS**

