2008 Ozone NAAQS Attainment Demonstrations

Emergency Burn Ban In Effect 10/26/24 - An emergency burn ban is now in effect for all Connecticut State Parks, Forests, and Wildlife Management areas, prohibiting the use of all outdoor grills, firepits, and campfires, and the kindling and use of flame outdoors. DEEP and local agencies are working to contain several active fires across the state. Please avoid all affected State Parks and Forests, as well as the blue-blazed Mattabesett Trail. The Enduro Trail in Voluntown and portions of North Stonington within the Pachaug State Forest are closed at this time. Rocky Neck State Park is also closed until further notice due to a brush fire. Please note that today's forest fire danger report remains at a 'very high' or 'extreme' level. More information about the current fire danger, burn ban and recommended safety measures can be found here

Attainment Demonstrations for the 2008 Ozone NAAQS

Attainment demonstrations are required by the Clean Air Act (CAA) for areas classified as moderate nonattainment or above. While both areas were originally designated as marginal nonattainment based on monitored ozone levels, these designations underestimated the significant persistence of the ozone problem and the areas were unable to attain the standard by the marginal deadline and were thereby reclassified by the EPA to moderate on June 3, 2016, and again reclassified to serious nonattainment on August 23, 2019.

Connecticut's Nonattainment Areas

New York-N. New Jersey-Long Island, NY-NJ-CT
Connecticut Counties included: Fairfield, New Haven, Middlesex

Greater Connecticut
Connecticut Counties included: Litchfield, Hartford, Tolland, Windham, New London

Statewide SIP Revisions for the Redesignation to Serious Nonattainment

This revision builds on the earlier SIPs below to fulfill the requirements for the reclassifications to serious nonattainment. Consideration is given for Greater Connecticut's Clean Data Determination, on July 13, 2020, indicating attainment of the standards in that area.

Final Submission, June 23, 2022

Cover Letter (PDF)
Technical Support Document (PDF)
Public Notice as Published (PDF)
Certification of Public Review Process (PDF)
Hearing Report (PDF)

Comments on October 2021 Proposed SIP:

Proposal:

Notice of Intent to Amend the SIP
Proposed Attainment Demonstration (October 2021)
- 2020 Motor Vehicle Emissions Budgets - MOVES data (ZIP file)

New York -N. New Jersey- Long Island, NY-NJ-CT Attainment Demonstration

This revision addresses the Connecticut portion of the New York-N. New Jersey-Long Island, NY-NJ-CT Nonattainment area (Southwest Connecticut: Fairfield, New Haven and Middlesex Counties). Specifically, DEEP is submitting the following to meet the requirement of an Attainment Demonstration under the moderate classification for the 2008 ozone standard and to address the 1997 ozone standard State Implementation Plan (SIP) call. The plan demonstrates that Connecticut has addressed the requirements as outlined under the Clean Air Act (CAA) for an area such as Southwest Connecticut. However, it also demonstrates that Connecticut is overwhelmingly impacted by out of state emissions. In fact, the worst observed air quality in Connecticut is 95% due to emissions other than Connecticut's sources. Therefore, the problem of ozone in Southwest Connecticut is only solvable if upwind states fully address their obligations under the Good Neighbor provisions of the CAA, which to date, they have failed to do so.

Final Submission, August 8, 2017 :

Cover Letter (PDF)
Enclosure A: Technical Support Document (PDF)
Appendix A- Demonstration that Connecticut's NNSR SIP Satisfies the Requirements for Implementation of the 2008 Ozone National Ambient Air Quality Standard (PDF)
Appendix B- Ozone Exceedance Analyses (webpage)
Appendix C- 2011 Base Year Inventory for RFP: Revisions Made to 2011 PEI
Appendix D- MOVES Input Files
- Excel Inputs (ZIP file)
- MOVES Inputs (ZIP file)
- MOVES Outputs (ZIP file)
- MOVES Run Specs (ZIP file)
Appendix E- Detailed Source Category Listings of 2011 and 2017 Estimated Emissions (XLS)
Appendix F- Connecticut DOT 2015 Statewide Transportation Improvement Program Project List
Enclosure B: Public Notice as Published
Enclosure C: Certification of Public Review Process
Enclosure D: Hearing Report

Public Hearing will be held July 25, 2017. All written comments must be received by July 25, 2017. See the Notice below for more details.

Notice of Intent to Amend the SIP
Proposed Attainment Demonstration
- Appendix A- Demonstration that Connecticut's NNSR SIP Satisfies the Requirements for Implementation of the 2008 Ozone National Ambient Air Quality Standard (PDF)
- Appendix B- Ozone Exceedance Analyses (webpage)
- Appendix C- 2011 Base Year Inventory for RFP: Revisions Made to 2011 PEI
- Appendix D- MOVES Input Files
  - Excel Inputs (ZIP file)
  - MOVES Inputs (ZIP file)
  - MOVES Outputs (ZIP file)
  - MOVES Run Specs (ZIP file)
- Appendix E- Detailed Source Category Listings of 2011 and 2017 Estimated Emissions (XLS)
- Appendix F- Connecticut DOT 2015 Statewide Transportation Improvement Program Project List

Greater Connecticut Attainment Demonstration

On January 17, 2017 DEEP submitted the the clean air plan, to demonstrate how Greater Connecticut will come into compliance with the 2008 national air quality standard for ozone, to the Environmental Protection Agency. This plan was developed to meet the requirements set out in the federal Clean Air Act, including a commitment to further reducing air pollution in Connecticut and adopting Motor Vehicle Emissions Budgets. All documents are in PDF format unless otherwise indicated.

Final Submission, January 17, 2017 :

Excel Inputs (ZIP file)
MOVES Inputs (ZIP file)
MOVES Outputs (ZIP file)
MOVES Run Specs (ZIP file)