40 CFR § 96.181 - General.

---
identifier: "/us/cfr/t40/s96.181"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 96.181 - General."
title_number: 40
title_name: "Protection of Environment"
section_number: "96.181"
section_name: "General."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "96"
part_name: "NOX BUDGET TRADING PROGRAM AND CAIR NOX AND SO2 TRADING PROGRAMS FOR STATE IMPLEMENTATION PLANS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401, 7403, 7410, 7601, and 7651,"
regulatory_source: "63 FR 57514, Oct. 27, 1998, unless otherwise noted."
cfr_part: "96"
---


# 96.181 General.

(a) Except as otherwise provided in §§ 96.101 through 96.104, §§ 96.106 through 96.108, and subparts BB and CC and subparts FF through HH of this part, a CAIR NO<sub>X</sub> opt-in unit shall be treated as a CAIR NO<sub>X</sub> unit for purposes of applying such sections and subparts of this part.

(b) Solely for purposes of applying, as provided in this subpart, the requirements of subpart HH of this part to a unit for which a CAIR opt-in permit application is submitted and not withdrawn and a CAIR opt-in permit is not yet issued or denied under this subpart, such unit shall be treated as a CAIR NO<sub>X</sub> unit before issuance of a CAIR opt-in permit for such unit.