# 40 CFR § 81.16: Metropolitan Denver Intrastate Air Quality Control Region

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/ecfr-40-81.16

## Section

- **Citation:** 40 CFR § 81.16
- **Heading:** Metropolitan Denver Intrastate Air Quality Control Region
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** September 22, 2026
- **Source:** Publisher's official text
- **Location:** Title 40—Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER C—AIR PROGRAMS > PART 81—DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES > Subpart B—Designation of Air Quality Control Regions

## Text

The Metropolitan Denver Intrastate Air Quality Control Region (Colorado) consists of the territorial area encompassed by the boundaries of the following jurisdictions or described area (including the territorial area of all municipalities (as defined in section 302(f) of the Clean Air Act, 42 U.S.C. 1857h(f)) geographically located within the outermost boundaries of the area so delimited):
In the State of Colorado: Adams County, Arapahoe County, Boulder County, Clear Creek County, Denver County, Douglas County, Gilpin County, Jefferson County.
(Sec. 301(a), 81 Stat. 490, 504; 42 U.S.C. 1857g(a), as amended by sec. 15(c)(2) of Pub. L. 91-604)
Note:
For purposes of identification, the Regions are referred to by Colorado authorities as follows:
Sec.
481.172 Comanche Intrastate Air Quality Control Region: Region Three.
481.173 Grand Mesa Intrastate Air Quality Control Region: Region Seven.
481.174 Pawnee Intrastate Air Quality Control Region: Region One.
481.175 San Isabel Intrastate Air Quality Control Region: Region Four.
481.176 San Luis Intrastate Air Quality Control Region: Region Five.
481.177 Yampa Intrastate Air Quality Control Region: Region Eight.
481.16 Metropolitan Denver Intrastate Air Quality Control Region: Region Two.

## Nearby sections

- [40 CFR § 81.1 § 81.1 Definitions.](https://www.frixlaw.com/law-library/statutes/ecfr-40-81.1.md)
- [40 CFR § 81.11 § 81.11 Scope.](https://www.frixlaw.com/law-library/statutes/ecfr-40-81.11.md)
- [40 CFR § 81.12 § 81.12 National Capital Interstate Air Quality Control Region (District of Columbia, Maryland, and Virginia).](https://www.frixlaw.com/law-library/statutes/ecfr-40-81.12.md)
- [40 CFR § 81.13 § 81.13 New Jersey-New York-Connecticut Interstate Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/ecfr-40-81.13.md)
- [40 CFR § 81.14 § 81.14 Metropolitan Chicago Interstate Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/ecfr-40-81.14.md)
- [40 CFR § 81.15 § 81.15 Metropolitan Philadelphia Interstate Air Quality Control Region (Pennsylvania-New Jersey-Delaware).](https://www.frixlaw.com/law-library/statutes/ecfr-40-81.15.md)
- [40 CFR § 81.16 § 81.16 Metropolitan Denver Intrastate Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/ecfr-40-81.16.md)
- [40 CFR § 81.17 § 81.17 Metropolitan Los Angeles Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/ecfr-40-81.17.md)
- [40 CFR § 81.18 § 81.18 Metropolitan St. Louis Interstate Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/ecfr-40-81.18.md)
- [40 CFR § 81.19 § 81.19 Metropolitan Boston Intrastate Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/ecfr-40-81.19.md)
- [40 CFR § 81.20 § 81.20 Metropolitan Cincinnati Interstate Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/ecfr-40-81.20.md)
- [40 CFR § 81.21 § 81.21 San Francisco Bay Area Intrastate Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/ecfr-40-81.21.md)
- [40 CFR § 81.22 § 81.22 Greater Metropolitan Cleveland Intrastate Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/ecfr-40-81.22.md)
- [40 CFR § 81.23 § 81.23 Southwest Pennsylvania Intrastate Air Quality Control Region.](https://www.frixlaw.com/law-library/statutes/ecfr-40-81.23.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/ecfr-40-81.16. Check the current official text before relying on it. Not legal advice.