40 CFR § 63.11872 - What is the relationship to other subparts in this part?

---
identifier: "/us/cfr/t40/s63.11872"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 63.11872 - What is the relationship to other subparts in this part?"
title_number: 40
title_name: "Protection of Environment"
section_number: "63.11872"
section_name: "What is the relationship to other subparts in this part?"
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "63"
part_name: "NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES"
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"
regulatory_source: "57 FR 61992, Dec. 29, 1992, unless otherwise noted."
cfr_part: "63"
---


# 63.11872 What is the relationship to other subparts in this part?

After the applicable compliance date specified in § 63.11875(a), (b) or (c), an affected source that is also subject to the provisions of other subparts in 40 CFR part 60 or this part is required to comply with this subpart and any other applicable subparts in 40 CFR part 60 or this part.