### Question
How does GENERAL PROVISIONS define exceptional event?


### Answer
Under *42 U.S.C. § 7619*, **exceptional event** is defined as:

> an event that—


(i) affects air quality

#### Citation:
  - *42 U.S.C. § 7619*
  - Heading: **CHAPTER 85-AIR POLLUTION PREVENTION AND CONTROL > SUBCHAPTER III-GENERAL PROVISIONS**

