### Question
Can you define what hazardous air pollutant means?


### Answer
**Hazardous air pollutant** is defined as the following in *42 U.S.C. § 7412*:

> any air pollutant listed pursuant to subsection (b) of this section

#### 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**

