Particle Pollution (PM2.5) Designation History
- 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 PM2.5 Standard - Letter from DEQ Secretary John Skvarla to EPA (Dec. 13, 2013)
- PM2.5 Nonattainment Areas in North Carolina
- Letter from DEQ Secretary Bill Ross to USEPA about Proposed PM2.5 Designations (Sept. 8, 2004)
- Letter from Gov. Mike Easley to USEPA Administrator Michael Leavitt regarding PM2.5 Nonattainment Designations (Sept. 9, 2004)
- North Carolina PM2.5 Design Values
2024 PM2.5 Annual Standard
On February 7, 2024, EPA strengthened the annual primary (health-based) National Ambient Air Quality Standard for fine particulate matter (PM2.5) from 12.0 µg/m3 to 9.0 µg/m3. DAQ is preparing for this designation process.