### Question
How does the law define standard of performance?


### Answer
Under *42 U.S.C. § 7602*, **standard of performance** is defined as:

> a requirement of continuous emission reduction, including any requirement relating to the operation or maintenance of a source to assure continuous emission reduction

#### Citation:
  - *42 U.S.C. § 7602*
  - Heading: **CHAPTER 85-AIR POLLUTION PREVENTION AND CONTROL > SUBCHAPTER III-GENERAL PROVISIONS**

