# 40 C.F.R. § 81.11 (2026): Scope

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/CFR_T40_P81_S81_11

## Section

- **Citation:** 40 C.F.R. § 81.11 (2026)
- **Heading:** Scope
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Title 40 CFR: Protection of Environment / Chapter I / Part 81 / Subpart B / § 81.11: § 81.11   Scope.

## Text

Air quality control regions designated by the Administrator pursuant to section 107 of the Act are listed in this subpart. Regions so designated are subject to revision, and additional regions may be designated, as the Administrator determines necessary to protect the public health and welfare.

## Nearby sections

- [40 C.F.R. § 81.11 (2026) § 81.11   Scope.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P81_S81_11.md)
- [40 C.F.R. § 81.12 (2026) § 81.12   National Capital Interstate Air Quality Control Region (District of Columbia, Maryland, and Virginia).](https://www.frixlaw.com/law-library/statutes/CFR_T40_P81_S81_12.md)
- [40 C.F.R. § 81.13 (2026) § 81.13   New Jersey-New York-Connecticut Interstate Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P81_S81_13.md)
- [40 C.F.R. § 81.14 (2026) § 81.14   Metropolitan Chicago Interstate Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P81_S81_14.md)
- [40 C.F.R. § 81.15 (2026) § 81.15   Metropolitan Philadelphia Interstate Air Quality Control Region (Pennsylvania-New Jersey-Delaware).](https://www.frixlaw.com/law-library/statutes/CFR_T40_P81_S81_15.md)
- [40 C.F.R. § 81.16 (2026) § 81.16   Metropolitan Denver Intrastate Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P81_S81_16.md)
- [40 C.F.R. § 81.17 (2026) § 81.17   Metropolitan Los Angeles Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P81_S81_17.md)
- [40 C.F.R. § 81.18 (2026) § 81.18   Metropolitan St. Louis Interstate Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P81_S81_18.md)
- [40 C.F.R. § 81.19 (2026) § 81.19   Metropolitan Boston Intrastate Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P81_S81_19.md)
- [40 C.F.R. § 81.20 (2026) § 81.20   Metropolitan Cincinnati Interstate Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P81_S81_20.md)
- [40 C.F.R. § 81.21 (2026) § 81.21   San Francisco Bay Area Intrastate Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P81_S81_21.md)
- [40 C.F.R. § 81.22 (2026) § 81.22   Greater Metropolitan Cleveland Intrastate Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P81_S81_22.md)
- [40 C.F.R. § 81.23 (2026) § 81.23   Southwest Pennsylvania Intrastate Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P81_S81_23.md)
- [40 C.F.R. § 81.24 (2026) § 81.24   Niagara Frontier Intrastate Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P81_S81_24.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/CFR_T40_P81_S81_11. Check the current official text before relying on it. Not legal advice.