40 CFR § 68.100 - Purpose.

---
identifier: "/us/cfr/t40/s68.100"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 68.100 - Purpose."
title_number: 40
title_name: "Protection of Environment"
section_number: "68.100"
section_name: "Purpose."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "68"
part_name: "CHEMICAL ACCIDENT PREVENTION PROVISIONS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7412(r), 7601(a)(1), 7661-7661f."
regulatory_source: "59 FR 4493, Jan. 31, 1994, unless otherwise noted."
cfr_part: "68"
---


# 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.