Section 5 CCR 1001-14-III - [Effective until 10/15/2024] Classification of Nonattainment and Attainment/Maintenance Areas in Colorado*, 5 Colo. Code Regs. § 1001-14-III (2025)

Section 5 CCR 1001-14-III - [Effective until 10/15/2024] Classification of Nonattainment and Attainment/Maintenance Areas in Colorado*

Carbon Monoxide

Area

Classification

Boundary

Denver Metro Area

Attainment/Maintenance (effective 1/14/02)

See attached legal description and map.

Colorado Springs

Attainment/Maintenance (effective 10/25/99)

Urban Transportation Planning Study Area as defined in 1989. See attached map.

Fort Collins

Attainment/Maintenance (effective 9/22/03)

Fort Collins Urban Growth Area boundary as adopted by the city of Fort Collins and the Larimer County Commissioners and in effect as of July 30, 1991. See attached map.

Greeley Area

Attainment/Maintenance (effective 5/10/99)

Urban Boundaries defined in the North Front Range Regional Transportation Plan, May 1990. See attached map.

Longmont

Attainment/Maintenance (effective 11/23/99)

Begin at Highway 52 and Boulder/Weld county line and go west to 95th Street/Hooker Road to the intersection of Plateau Road, then west on Plateau Road to the intersection of N. 75th Street, then north to the Boulder/Larimer County line, then east along the Boulder/Larimer County line to the Boulder/Weld county line, then south along the Boulder/Weld County line to Highway 52, plus the portion of the City of Longmont east of the Boulder/Weld County line in Weld County. See attached map.

Description of Boundaries for Denver Metropolitan Carbon Monoxide Attainment/Maintenance Area

The Boundaries for the Denver metropolitan attainment/maintenance area for carbon monoxide (CO) are described as follows:

Starting at Colorado Highway 52 where it intersects the eastern boundary of Boulder County;

Follow Highway 52 where it intersects Colorado Highway 119;

Follow northern boundary of Boulder city limits west to the 6000-ft. elevation line;

Follow the 6000-ft. elevation line south through Boulder and Jefferson counties to US 6 in Jefferson County;

Follow US 6 west to the Jefferson County-Clear Creek County line;

Follow the Jefferson County western boundary south to the southern boundary of Range 72 West, Township 6 South, Section 24;

Follow the southern section line east to the eastern boundary of Range 71 West, Township 6 South, Section 24;

Follow the eastern section line north to South Turkey Creek;

Follow South Turkey Creek northeast to Deer Creek Canyon Road;

Follow Deer Creek Canyon Road to the eastern boundary of Range 69 West, Township 6 South, Section 5;

Follow the Pike National Forest boundary southeast through Douglas County to the Douglas County - El Paso County line;

Follow the southern boundary of Douglas County east to the Elbert County line;

Follow the eastern boundary of Douglas County north to the Arapahoe county line;

Follow the southern boundary of Arapahoe County east to Kiowa Creek;

Follow Kiowa Creek northeast through Arapahoe county and Adams counties to the Adams County - Weld County line;

Follow the northern boundary of Adams County west to the Boulder County line;

Follow the eastern boundary of Boulder County north to Highway 52.

Descriptions and Maps

III.A.Denver Attainment/Maintenance Area for Carbon Monoxide

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III.B.Colorado Springs Attainment/Maintenance Area for Carbon Monoxide

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III.C.Fort Collins Attainment/Maintenance Area for Carbon Monoxide

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III.D.Greeley Attainment/Maintenance Area for Carbon Monoxide

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III.E.Longmont Attainment/Maintenance Area for Carbon Monoxide

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Area

Classification

Boundary

PM10

Denver Metro (effective 10/16/02)

Attainment/Maintenance *

All of Denver, Jefferson, and Douglas Counties; Boulder County (excluding Rocky Mountain National Park) and the Automobile Inspection and Readjustment Program portions of Adams and Arapahoe Counties. See attached map.

Steamboat Springs (effective 11/24/04)

Attainment/Maintenance

Steamboat Springs Area Airshed as adopted by the Routt County Commissioners May 28, 1991. See attached map.

Pagosa Springs (effective 8/14/01)

Attainment/Maintenance

See attached map.

Telluride/Mt. Village/San Miguel County (effective 8/14/01)

Attainment/Maintenance

See attached map.

Aspen/Pitkin County (effective 7/14/03)

Attainment/Maintenance

See attached map.

Cañon City/Fremont County (effective 7/31/00)

Attainment/ Maintenance

See attached map.

Lamar (effective 11/25/05)

Attainment/Maintenance

Lamar City Limits as of July 30, 1991. See attached map.

Ozone

Denver 1-Hour Ozone Attainment/Maintenance Area (effective 10/11/01)

Attainment/Maintenance

The Counties of Jefferson and Douglas, the Cities and Counties of Denver and Broomfield, Boulder County (excluding Rocky Mountain National Park), Adams County west of Kiowa Creek, and Arapahoe County west of Kiowa Creek. See attached map.

Denver Metro Area/North Front Range 8-Hour Ozone Nonattainment Area (effective 11/20/07)

Nonattainment

The Counties of Adams, Arapahoe, Boulder (includes part of Rocky Mountain National Park), Douglas, and Jefferson; the Cities and Counties of Denver and Broomfield; and the following portions of the Counties of Larimer and Weld:

For Larimer County (includes part of Rocky Mountain National Park), that portion of the county that lies south of a line described as follows: Beginning at a point on Larimer County's eastern boundary and Weld County's western boundary intersected by 40 degrees, 42 minutes, and 47.1 seconds north latitude, proceed west to a point defined by the intersection of 40 degrees, 42 minutes, 47.1 seconds north latitude and 105 degrees, 29 minutes, and 40.0 seconds west longitude, thence proceed south on 105 degrees, 29 minutes, 40.0 seconds west longitude to the intersection with 40 degrees, 33 minutes and 17.4 seconds north latitude, thence proceed west on 40 degrees, 33 minutes, 17.4 seconds north latitude until this line intersects Larimer County's western boundary and Grand County's eastern boundary.

For Weld County, that portion of the county that lies south of a line described as follows: Beginning at a point on Weld County's eastern boundary and Logan County's western boundary intersected by 40 degrees, 42 minutes, 47.1 seconds north latitude, proceed west on 40 degrees, 42 minutes, 47.1 seconds north latitude until this line intersects Weld County's western boundary and Larimer County's eastern boundary.

See attached map.

*The classification of the Denver Metro Area as an attainment/maintenance area shall not affect Air Quality Control Commission Regulations Number 1, 5 CCR 1001-3, Section VIII; or Number 3, 5 CCR 1001-5, Part B, Section IV.D.2(d)(i) or (ii). Such provisions shall apply in the Denver Metro Area in the same manner as they would apply if the Denver Metro Area were nonattainment area for PM10.

III.F.Denver PM10 and 1-Hour Ozone Attainment/Maintenance Area

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III.G.Steamboat Springs Attainment/Maintenance Area for PM10

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III.H.Pagosa Springs Attainment/Maintenance Area for PM10

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III.I.Telluride/Mt. Village/San Miguel County Attainment/Maintenance Area for PM10

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III.J.Aspen/Pitkin County Attainment/Maintenance Area for PM10

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III.K.Cañon City/Fremont County Attainment/Maintenance Area for PM10

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III.L.Lamar Attainment/Maintenance Area for PM10

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III.M.Denver Metro Area/North Front Range 8-Hour Ozone Nonattainment Area, 2008 Ozone National Ambient Air Quality Standard

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III.O.Denver Metro Area/North Front Range and northern Weld County 8-Hour Ozone Nonattainment Area, 2015 Ozone National Ambient Air Quality Standard

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5 CCR 1001-14-III

39 CR 24, December 25, 2016, effective 1/14/2017
44 CR 02, January 25, 2021, effective 2/14/2021
46 CR 02, January 25, 2022, effective 2/14/2023
47 CR 02, January 25, 2024, effective 2/14/2024
Section 5 CCR 1001-14-III - [Effective until 10/15/2024] Classification of Nonattainment and Attainment/Maintenance Areas in Colorado*, 5 Colo. Code Regs. § 1001-14-III (2025)
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