A wave of ground-level ozone alerts is set to blanket the Southeast on Friday, as a stagnant, sun-drenched air mass pushes smog toward unhealthy levels from metro Atlanta through the Carolina Piedmont and South Carolina’s Upstate.
A Multi-State Patchwork of Alerts
Environmental agencies in three states issued Code Orange Air Quality Action Days for ozone, most of them in force Friday, June 5. A Code Orange means air quality is expected to be Unhealthy for Sensitive Groups — an Air Quality Index between 101 and 150.
In Georgia, the state Department of Natural Resources’ Environmental Protection Division flagged metro Atlanta for Friday. In North Carolina, alerts cover the Charlotte area — Mecklenburg, Cabarrus and Rowan counties — along with the Triad around Winston-Salem, Greensboro and High Point, plus Davie, Stokes, Rockingham and Caswell counties, issued by the North Carolina Division of Air Quality and Forsyth County environmental officials.
In South Carolina, the Department of Environmental Services called a Code Orange for the Upstate, including Greenville, Spartanburg and Anderson, from 10 a.m. to 8 p.m. Friday.
Why the Air Turns Unhealthy
Ground-level ozone — the main ingredient in summer smog — is not emitted directly from any tailpipe or smokestack. It forms when sunlight cooks a chemical reaction between nitrogen oxides and volatile organic compounds released by vehicles, power plants and industry. Hot, bright, stagnant days are the trigger.
South Carolina forecasters spelled out exactly that setup. Dominant high pressure was expected to keep skies clear, humidity low and winds light — conditions that allow ozone to build while doing little to disperse it. Those factors, the SCDES warned, will likely produce “unhealthy concentrations of ground level ozone air pollution” over an already pollutant-loaded atmosphere.
The episode is also part of a much larger pattern: similar ozone alerts blanketed the Great Lakes and Ohio Valley this week, underscoring how widely the warm, stagnant air mass has settled over the eastern U.S.
Who Should Take Care — and When
Ozone is a lung irritant that can inflame airways, trigger coughing and aggravate asthma. Sensitive groups — children, older adults and people with asthma, heart or lung disease — should cut back on prolonged or strenuous outdoor activity, especially in the late afternoon and early evening, when ozone concentrations typically peak.
Atlanta is no stranger to the problem. The metro has long struggled with summertime ozone, and the area has fallen short of federal ozone attainment standards for decades — a reminder that Code Orange days are a recurring feature of the Southeastern summer rather than a one-off.
Simple Steps to Cut the Pollution
Officials note that residents can help ease the load. Recommended actions include combining errands, carpooling, walking or biking instead of driving alone, reducing vehicle idling, packing a lunch rather than driving to it, conserving electricity, and keeping vehicles properly tuned.
Residents can check real-time conditions and forecasts through the federal AirNow portal or their state air-quality agencies as the alerts are reassessed each day.
