### Question
What does regulated substance mean?


### Answer
**Regulated substance** has the following meaning in *42 U.S.C. § 7412*:

> a substance listed under paragraph (3)

#### 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**

