SIP Status Reports
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Status of Colorado Designated Areas
Status of Colorado Designated Areas
Colorado Areas by NAAQSNOTE: As of 03/12/2021, these reports are no longer being updated. For the latest information, see the SIP Status Tools.
Jump to Colorado section for: CO (1971) Lead (1978) Lead (2008) NO2 (1971) Ozone-1Hr (1979) Ozone-8Hr (1997) Ozone-8Hr (2008) Ozone-8Hr (2015) PM-10 (1987) PM-2.5 (1997) PM-2.5 (2006) PM-2.5 (2012) SO2 (1971) SO2 (2010)
Colorado CO (1971) Areas Return to map |
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Click on the Area name to view SIP Required Elements Area |
Status | Designation Date |
Classification | 2010 Population (state portion) |
Meets NAAQS Basis |
Design Value Annual (ppm) (entire area) |
Meets NAAQS |
SIP Requirements Original/ Approved |
Clean Air Determination Citation Effective Date Click to view FR notice |
Redesignation Request Date |
Redesignation Citation Effective Date Click to view FR notice |
Colorado Springs Area | Maintenance | 11/15/1990 | Moderate <= 12.7ppm | 555,742 | 2019 | 1.6 | Yes | 4 / 4 | |
08/19/1998 | 10/25/1999 64 FR 46279 |
Denver-Boulder Area | Maintenance | 11/15/1990 | Serious | 2,610,637 | 2019 | 2.9 | Yes | 7 / 7 | |
05/10/2000 | 01/14/2002 66 FR 64751 |
Fort Collins Area | Maintenance | 11/15/1990 | Moderate <= 12.7ppm | 170,639 | 2019 | 1.6 | Yes | 4 / 4 | |
08/09/2002 | 09/22/2003 68 FR 43316 |
Greeley Area | Maintenance | 11/15/1990 | Not Classified | 138,101 | 2019 | 0.9 | Yes | 1 / 1 | |
09/22/1997 | 05/10/1999 64 FR 11775 |
Longmont Area | Maintenance | 11/15/1990 | Moderate <= 12.7ppm | 86,558 | 2019 | No Data | 5 / 5 | |
08/19/1998 | 11/23/1999 64 FR 51694 |
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Colorado Lead (1978) Areas Return to map Top of page |
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No designated areas for this pollutant. | |||||||||||
Colorado Lead (2008) Areas Return to map Top of page |
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No designated areas for this pollutant. | |||||||||||
Colorado NO2 (1971) Areas Return to map Top of page |
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No designated areas for this pollutant. | |||||||||||
Colorado Ozone-1Hr (1979) Areas Return to map Top of page |
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Click on the Area name to view SIP Required Elements Area |
Status | Designation Date |
Classification | 2010 Population (state portion) |
Meets NAAQS Basis |
Design Value Annual (ppm) (entire area) |
Meets NAAQS |
SIP Requirements Original/ Approved |
Clean Air Determination Citation Effective Date Click to view FR notice |
Redesignation Request Date |
Redesignation Citation Effective Date Click to view FR notice |
Denver-Boulder Area | Maintenance (NAAQS revoked) | 11/15/1990 | Transitional | 2,770,524 | 2017-2019 | 0.101 | Yes | 2 / 2 | |
08/12/1996 | 10/11/2001 66 FR 47086 |
Colorado Ozone-8Hr (1997) Areas Return to map Top of page |
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Click on the Area name to view SIP Required Elements Area |
Status | Designation Date |
Classification | 2010 Population (state portion) |
Meets NAAQS Basis |
Design Value Annual (ppm) (entire area) |
Meets NAAQS |
SIP Requirements Original/ Approved |
Clean Air Determination Citation Effective Date Click to view FR notice |
Redesignation Request Date |
Redesignation Citation Effective Date Click to view FR notice |
Denver-Boulder-Greeley-Ft. Collins-Loveland | Nonattainment (NAAQS revoked) | 11/20/2007 | Subpart 2/Marginal | 3,330,139 | 2017-2019 | 0.078 | Yes | 3 / 1 | |
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Colorado Ozone-8Hr (2008) Areas Return to map Top of page |
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Click on the Area name to view SIP Required Elements Area |
Status | Designation Date |
Classification | 2010 Population (state portion) |
Meets NAAQS Basis |
Design Value Annual (ppm) (entire area) |
Meets NAAQS |
SIP Requirements Original/ Approved |
Clean Air Determination Citation Effective Date Click to view FR notice |
Redesignation Request Date |
Redesignation Citation Effective Date Click to view FR notice |
Denver-Boulder-Greeley-Ft. Collins-Loveland | Nonattainment | 07/20/2012 | Serious | 3,330,139 | 2017-2019 | 0.078 | No | 59 / 47 | |
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Colorado Ozone-8Hr (2015) Areas Return to map Top of page |
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Click on the Area name to view SIP Required Elements Area |
Status | Designation Date |
Classification | 2010 Population (state portion) |
Meets NAAQS Basis |
Design Value Annual (ppm) (entire area) |
Meets NAAQS |
SIP Requirements Original/ Approved |
Clean Air Determination Citation Effective Date Click to view FR notice |
Redesignation Request Date |
Redesignation Citation Effective Date Click to view FR notice |
Denver Metro/North Front Range | Nonattainment | 08/03/2018 | Marginal | 3,329,773 | 2017-2019 | 0.078 | No | 3 / 0 | |
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Colorado PM-10 (1987) Areas Return to map Top of page |
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Click on the Area name to view SIP Required Elements Area |
Status | Designation Date |
Classification | 2010 Population (state portion) |
Meets NAAQS Basis |
Average Estimated Exceedances (est. exc.) (entire area) |
Meets NAAQS |
SIP Requirements Original/ Approved |
Clean Air Determination Citation Effective Date Click to view FR notice |
Redesignation Request Date |
Redesignation Citation Effective Date Click to view FR notice |
Adams, Denver, and Boulder Counties; Denver Metropolitan area | Maintenance | 11/15/1990 | Moderate | 2,770,524 | 2017-2019 | 0.3 | Yes | 3 / 3 | |
07/30/2001 | 10/16/2002 67 FR 58335 |
Archuleta County; Pagosa Springs | Maintenance | 11/15/1990 | Moderate | 2,261 | 2017-2019 | 0.0 | Yes | 3 / 3 | |
05/10/2000 | 08/14/2001 66 FR 32556 |
Fremont County; Canon City Area | Maintenance | 11/15/1990 | Moderate | 18,860 | 2017-2019 | Insufficient Data | 3 / 3 | |
09/22/1997 | 07/31/2000 65 FR 34399 |
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Pitkin County; Aspen | Maintenance | 11/15/1990 | Moderate | 6,772 | 2017-2019 | 0.0 | Yes | 3 / 3 | |
11/09/2001 | 07/14/2003 68 FR 26212 |
Prowers County; Lamar | Maintenance | 11/15/1990 | Moderate | 7,523 | 2017-2019 | 0.3 | Yes | 3 / 3 | |
07/31/2002 | 11/25/2005 70 FR 61563 |
Routt County (part); Steamboat Springs | Maintenance | 01/20/1994 | Moderate | 12,088 | 2017-2019 | 0.3 | Yes | 3 / 3 | |
07/31/2002 | 11/24/2004 69 FR 62210 |
San Miguel County; Telluride | Maintenance | 11/15/1990 | Moderate | 2,014 | 2017-2019 | 0.0 | Yes | 3 / 3 | |
05/10/2000 | 08/14/2001 66 FR 32556 |
Colorado PM-2.5 (1997) Areas Return to map Top of page |
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No designated areas for this pollutant. | |||||||||||
Colorado PM-2.5 (2006) Areas Return to map Top of page |
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No designated areas for this pollutant. | |||||||||||
Colorado PM-2.5 (2012) Areas Return to map Top of page |
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No designated areas for this pollutant. | |||||||||||
Colorado SO2 (1971) Areas Return to map Top of page |
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No designated areas for this pollutant. | |||||||||||
Colorado SO2 (2010) Areas Return to map Top of page |
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No designated areas for this pollutant. |
We have made our best effort to ensure that the data contained in these reports is accurate. We note that there may be brief delays in
updating the reports as we receive new state submissions and we take rulemaking action on plans. In order to assist us in providing
accurate information, we request that you contact us by clicking on the "Contact Us" link near the top of this page with any comments
regarding or corrections to the posted information, including concerns about whether the entries reflect the most recent status. Current and historical design value data can be found on the EPA Air Quality Design Values website and the EPA Green Book contains comprehensive nonattainment area, designation status, and historical information. The level of the 1-hour NAAQS for sulfur dioxide is 75 parts per billion (ppb) calculated as the 3-year average of the 99th percentile of the annual distribution of daily maximum 1-hour average concentrations. |