40 CFR § 52.14 - State ambient air quality standards.

---
identifier: "/us/cfr/t40/s52.14"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 52.14 - State ambient air quality standards."
title_number: 40
title_name: "Protection of Environment"
section_number: "52.14"
section_name: "State ambient air quality standards."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "52"
part_name: "APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS"
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"
cfr_part: "52"
---


# 52.14 State ambient air quality standards.

Any ambient air quality standard submitted with a plan which is less stringent than a national standard is not considered part of the plan.