Sulfur Dioxide (SO2) Designation History

Background

• SO₂ Health and Background Information from the U.S. Environmental Protection Agency (USEPA)

• North Carolina SO₂ Design Values from Air Quality Monitoring

Designations

• Designations Related to the Sulfur Dioxide (SO₂) Data Requirements Rule

  • 12/21/2020 - EPA's Final Rule 4 Boundary Designations for the 2010 1-Hour Sulfur Dioxide (SO₂) National Ambient Air Quality Standard.

    • Federal Register Notice (86 FR 16055; March 26, 2021)

    • Letter from EPA to Governor Cooper and Technical Support Document (12/21/2020)

  • 12/21/2017 - EPA's Final Boundary Designations for the 2010 1-Hour Sulfur Dioxide (SO₂) National Ambient Air Quality Standard.

    • Federal Register Notice

    • EPA Technical Support Document

  • 10/23/2017 - State of North Carolina's Response to EPA's 120-Day Letter

    • Letter to EPA

  • 8/22/2017 - EPA's 120 Day Letter Responding to NC's January 13, 2017 Boundary Recommendations

    • Letter to the NC Governor
    • Technical Support Document

  • 1/13/2017  - North Carolina's Recommendation on Boundaries for the 2010 1-Hour Sulfur Dioxide (SO₂) National Ambient Air Quality Standard

    • Transmittal Letter to EPA
    • State of North Carolina's Recommendation on Boundaries For the 2010 1-Hour Sulfur Dioxide National Ambient Air Quality Standard
    • Attachment A - North Carolina's 2010 SO₂ NAAQS Boundary Recommendation
    • Attachment B - Maps of Modeled Facilites
    • Attachment C - Maps of Monitored Facilites
    • Attachment D - Maps of Ambient Air Quality Monitors
    • Attachment E - SO₂ Facilities and their 2015 Emissions

  • 6/30/2016 -  North Carolina SO₂ Data Requirements Rule Air Quality Characterization Submittal

    • Air Quality Characterization via Modeling – Modeling Reports
      • Transmittal to EPA
      • Duke Energy Progress Belews Creek Generating Station
      • Duke Energy Progress Marshall Steam Station
      • Duke Energy Progress Mayo Electric Generating Electric Plant
      • Duke Energy Allen Steam Station
    • Air Quality Characterization via Modeling – Modeling Protocols

      • Duke Energy Carolinas, LLC – Allen Steam Station

      • Duke Energy Progress, Inc. – Asheville Steam Electric Plant

      • Duke Energy Progress, LLC – Mayo Facility

      • Duke Energy Carolinas, LLC – Marshall Steam Station

      • Duke Energy Carolinas, LLC – Belews Creek Steam Station

    • Air Quality Characterization via Monitoring  –
      Plans for characterization of air quality via monitoring for the following facilities are included in North Carolina’s Annual Monitoring Network Plan:   

      • PCS Phosphate Company, Inc. - Aurora

      • CPI USA North Carolina – Southport Plant

      • Blue Ridge Paper Products – Canton Mill

      • Duke Energy Progress, LLC – Roxboro Plant

  • 3/18/2016 - EPA response to NC's Facilities in North Carolina Subject to the SO2 Data Requirements Rule

  • 1/15/2016 - Facilities in North Carolina Subject to the SO₂ Data Requirements Rule

• Designations for Brunswick County

  • 9/28/2021 – USEPA Final Rule:  Redesignation of the Brunswick County 2010 Sulfur Dioxide Unclassifiable Area (86 FR 53555)

  • 7/2/2021 – USEPA Proposed Rule:  Air Quality Designations; NC: Redesignation of the Brunswick County 2010 Sulfur Dioxide Unclassifiable Area (86 FR 35254)

  • 4/23/2021 – Redesignation Request for Brunswick County for the 2010 1-Hour Sulfur Dioxide Primary NAAQS

  • 6/30/2016 – EPA’s second round of SO₂ designations

    • EPA designation letter for Brunswick County, 6/30/16

    • EPA Technical Support Document for Brunswick County, 6/30/16

  • 4/19/2016 - North Carolina's Updated Boundary Recommendations for Brunswick County and New Hanover County

    • Attachment: CPI Southport Permit, issued 4/18/2016

  • 2/16/2016 - EPA Response (120-day letter) and Technical Support Document

  • 9/18/2015 - North Carolina's Boundary Recommendations for Brunswick County and New Hanover County

• Initial Statewide Boundary Recommendations

  • 4/8/2013 - North Carolina's Recommendations for Air Quality Designations for the Sulfur Dioxide Standard

  • 6/2/2011 - North Carolina SO₂ Boundary Recommendation

  • 4/12/2011 - North Carolina SO₂ Draft Boundary Options (pdf)

Implementation

• EPA's SO₂ Implementation Guidance

• 7/14/2014 - NCDAQ's Comments on USEPA's Data Requirements Rule for the 1-Hour SO₂ Standard

• 6/29/2012 - NCDAQ's Comments on USEPA's Proposed SO₂ Implementation

2010 1-hour SO₂ Standard

• 6/22/2010 - EPA's Final 1-hour SO₂ NAAQS Rule

• 12/8/2009 - NCDAQ's Comments on USEPA's Proposed SO₂ Standard