40 CFR § 97.121 - Submission of CAIR permit applications.

---
identifier: "/us/cfr/t40/s97.121"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 97.121 - Submission of CAIR permit applications."
title_number: 40
title_name: "Protection of Environment"
section_number: "97.121"
section_name: "Submission of CAIR permit applications."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "97"
part_name: "FEDERAL NOX BUDGET TRADING PROGRAM, CAIR NOX AND SO2 TRADING PROGRAMS, CSAPR NOX AND SO2 TRADING PROGRAMS, AND TEXAS SO2 TRADING PROGRAM"
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. 7401, 7403, 7410, 7426, 7491, 7601, and 7651,"
regulatory_source: "65 FR 2727, Jan. 18, 2000, unless otherwise noted. 71 FR 25396, 25422, and 25443, Apr. 28, 2006"
cfr_part: "97"
---


# 97.121 Submission of CAIR permit applications.

(a) *Duty to apply.* The CAIR designated representative of any CAIR NO<sub>X</sub> source required to have a title V operating permit shall submit to the permitting authority a complete CAIR permit application under § 97.122 for the source covering each CAIR NO<sub>X</sub> unit at the source at least 18 months (or such lesser time provided by the permitting authority) before the later of January 1, 2009 or the date on which the CAIR NO<sub>X</sub> unit commences commercial operation, except as provided in § 97.183(a).

(b) *Duty to reapply.* For a CAIR NO<sub>X</sub> source required to have a title V operating permit, the CAIR designated representative shall submit a complete CAIR permit application under § 97.122 for the source covering each CAIR NO<sub>X</sub> unit at the source to renew the CAIR permit in accordance with the permitting authority's title V operating permits regulations addressing permit renewal, except as provided in § 97.183(b).