SIP Status Reports
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Status of Connecticut Designated Areas
Status of Connecticut Designated Areas
Connecticut Areas by NAAQSNOTE: As of 03/12/2021, these reports are no longer being updated.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 Connecticut 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)
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Connecticut 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 |
| Hartford-New Britain-Middletown Area | Maintenance | 11/15/1990 | Moderate <= 12.7ppm | 1,106,678 | 2019 | 1.0 | Yes | 4 / 4 | |
09/30/1994 | 01/02/1996 61 FR 24239 |
| New Haven-Meriden-Waterbury Area | Maintenance | 11/15/1990 | Not Classified | 945,612 | 2019 | 1.2 | Yes | 0 / 0 | |
01/22/1997 | 12/04/1998 63 FR 53282 |
| New York-N. New Jersey-Long Island Area | Maintenance | 11/15/1990 | Moderate > 12.7ppm | 907,442 | 2019 | 2.7 | Yes | 6 / 6 | |
05/29/1998 | 05/10/1999 64 FR 12005 |
Connecticut Lead (1978) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
Connecticut Lead (2008) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
Connecticut NO2 (1971) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
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Connecticut 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 |
| Greater Connecticut Area | Nonattainment (NAAQS revoked) | 11/15/1990 | Serious | 2,666,958 | 2017-2019 | 0.106 | Yes | 26 / 26 | 04/16/2012 77 FR 15607 |
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| New York-N. New Jersey-Long Island Area | Nonattainment (NAAQS revoked) | 11/15/1990 | Severe-17 | 907,442 | 2017-2019 | 0.114 | Yes | 30 / 27 | 07/18/2012 77 FR 36163 |
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| OTR 1990 | 5 / 5 | |
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| OTR | 13 / 13 | |
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Connecticut 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 |
| Greater Connecticut Area | Nonattainment (NAAQS revoked) | 06/15/2004 | Subpart 2/Moderate | 1,629,115 | 2017-2019 | 0.075 | Yes | 53 / 52 | 09/30/2010 75 FR 53219 |
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| New York-N. New Jersey-Long Island Area | Nonattainment (NAAQS revoked) | 06/15/2004 | Subpart 2/Moderate | 1,944,982 | 2017-2019 | 0.082 | Yes | 53 / 52 | 07/18/2012 77 FR 36163 |
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| OTR | 46 / 46 | |
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Connecticut 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 |
| Greater Connecticut | Nonattainment | 07/20/2012 | Serious | 1,629,115 | 2017-2019 | 0.075 | Yes | 59 / 53 | 08/12/2020 85 FR 41924 |
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| New York-N. New Jersey-Long Island | Nonattainment | 07/20/2012 | Serious | 1,944,982 | 2017-2019 | 0.082 | No | 59 / 53 | |
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| OTR | 47 / 46 | |
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Connecticut 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 |
| Greater Connecticut | Nonattainment | 08/03/2018 | Marginal | 1,629,115 | 2017-2019 | 0.075 | No | 3 / 0 | |
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| New York-Northern New Jersey-Long Island | Nonattainment | 08/03/2018 | Moderate | 1,944,982 | 2017-2019 | 0.082 | No | 53 / 0 | |
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| OTR | 46 / 0 | |
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Connecticut 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 |
| New Haven County | Maintenance | 11/15/1990 | Moderate | 129,779 | 2017-2019 | No Data | 3 / 3 | |
06/23/2005 | 12/12/2005 70 FR 59657 |
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Connecticut PM-2.5 (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 (µg/m3) (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 |
| New York-N. New Jersey-Long Island | Maintenance (NAAQS revoked) | 04/05/2005 | Former Subpart 1 | 1,779,306 | 2017-2019 | 10.3 | Yes | 5 / 1 | 12/15/2010 75 FR 69589 |
06/22/2012 | 10/24/2013 78 FR 58467 |
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Connecticut PM-2.5 (2006) Areas Return to map Area designated nonattainment for the 24-hour standard 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 24-Hr (µg/m3) (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 |
| New York-N. New Jersey-Long Island | Maintenance | 12/14/2009 | Former Subpart 1 | 1,779,306 | 2017-2019 | 23 | Yes | 6 / 0 | 12/31/2012 77 FR 76867 |
06/22/2012 | 10/24/2013 78 FR 58467 |
Connecticut PM-2.5 (2012) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
Connecticut SO2 (1971) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
Connecticut 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. |