---
kind: "section"
citation: "40 C.F.R. § 68.100"
title: "40"
number: "68.100"
heading: "Purpose."
url: "https://uscodex.org/cfr/40/68.100"
---

# §68.100. Purpose.


This subpart designates substances to be listed under section 112(r)(3), (4), and (5) of the Clean Air Act, as amended, identifies their threshold quantities, and establishes the requirements for petitioning to add or delete substances from the list.


## Notes

### Source

Source: 59 FR 4493, Jan. 31, 1994, unless otherwise noted. Redesignated at 61 FR 31717, June 20, 1996.

### Authority

Authority: 42 U.S.C. 7412(r), 7601(a)(1), 7661-7661f.

### Source

Source: 59 FR 4493, Jan. 31, 1994, unless otherwise noted.