### Question
How is the "new source" defined?


### Answer
The term **new source** is defined in *42 U.S.C. § 7411* as follows -

> any stationary source, the construction or modification of which is commenced after the publication of regulations (or, if earlier, proposed regulations) prescribing a standard of performance under this section which will be applicable to such source

#### Citation:
  - *42 U.S.C. § 7411*
  - Heading: **CHAPTER 83-ENERGY EXTENSION SERVICE > SUBCHAPTER I-PROGRAMS AND ACTIVITIES > Part A-Air Quality and Emission Limitations**

