### Question
Can you define what dilute means?


### Answer
**Dilute** is defined as the following in *42 U.S.C. § 7403*:

> a concentration of less than 1 percent by volume

#### Citation:
  - *42 U.S.C. § 7403*
  - Heading: **CHAPTER 85-AIR POLLUTION PREVENTION AND CONTROL > SUBCHAPTER I-PROGRAMS AND ACTIVITIES > Part A-Air Quality and Emission Limitations**

