Particle Pollution (PM2.5) Designation History

2024 Revised Annual Standard

• North Carolina's Recommendations for Air Quality Designations for the 2024 Revised Primary Annual Fine Particle Standard - Letter from DEQ Secretary Mary Penny Kelley to EPA (Dec. 23, 2024)
• Exceptional Events Demonstration to Support Attainment Designation Recommendations for 2024 Annual PM2.5 NAAQS 

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2012 Revised Annual Standard

• EPA letter to Governor Pat McCrory on final PM 2.5 designations, Dec. 18, 2014
• EPA letter to Governor Pat McCrory on PM 2.5 Designations, Aug. 19, 2014
• North Carolina's Recommendations for Air Quality Designations for the 2012 Revised Annual PM_2.5 Standard - Letter from DEQ Secretary John Skvarla to EPA (Dec. 13, 2013)

Additional PM_2.5 Designation Information

• PM_2.5 Nonattainment Areas in North Carolina
• Letter from DEQ Secretary Bill Ross to USEPA about Proposed PM_2.5 Designations (Sept. 8, 2004)
• Letter from Gov. Mike Easley to USEPA Administrator Michael Leavitt regarding PM_2.5 Nonattainment Designations (Sept. 9, 2004)
• North Carolina PM_2.5 Design Values