### Question
What is the definition of hazardous air pollutant?


### Answer
The definition of **hazardous air pollutant** is as follows in *42 U.S.C. § 7412*:

> any air pollutant listed pursuant to subsection (b)

#### Citation:
  - *42 U.S.C. § 7412*
  - Heading: **CHAPTER 85-AIR POLLUTION PREVENTION AND CONTROL > SUBCHAPTER I-PROGRAMS AND ACTIVITIES > Part A-Air Quality and Emission Limitations**

