### Question
How does PROGRAMS AND ACTIVITIES define existing source?


### Answer
Under *42 U.S.C. § 7411*, **existing source** is defined as:

> any stationary source other than a new source

#### Citation:
  - *42 U.S.C. § 7411*
  - Heading: **SUBCHAPTER I-PROGRAMS AND ACTIVITIES > Subchapter Referred to in Other Sections > Amendments**

