For 8/26/2025
[ The forecast is updated daily by 3:30 pm EDT. ]
As of Monday afternoon, all forecast regions are trending towards a code green finish. The overnight passage of a cold front across the region is anticipated to bring a much needed reprieve to the high moisture content felt last week. A mostly cloudy morning will be accompanied by a light Northerly breeze. The afternoon is forecast to see a decrease in wind speeds and a shift to out of the Northeast. This wind direction is important because it is likely to cause an urban pluming effect for monitors just South of the larger metropolitan areas. While conditions are conducive to seeing an uptick in surface ozone production, significantly increased levels of ozone generation is not to be expected. Overall for Tuesday, Catawba and the Upstate are projected to peak in code Yellow, with all remaining forecast regions in code Green.
| County * |
Color Code |
AQI |
| Abbeville |
Moderate (Yellow) |
51 |
| Aiken |
Good (Green) |
44 |
| Anderson |
Moderate (Yellow) |
51 |
| Barnwell |
Good (Green) |
44 |
| Berkeley |
Good (Green) |
46 |
| Calhoun |
Good (Green) |
48 |
| Charleston |
Good (Green) |
46 |
| Cherokee |
Moderate (Yellow) |
51 |
| Chester |
Moderate (Yellow) |
54 |
| Chesterfield |
Good (Green) |
44 |
| Darlington |
Good (Green) |
44 |
| Dillon |
Good (Green) |
44 |
| Dorchester |
Good (Green) |
46 |
| Edgefield |
Good (Green) |
44 |
| Fairfield |
Good (Green) |
48 |
| Florence |
Good (Green) |
44 |
| Greenville |
Moderate (Yellow) |
51 |
| Greenwood |
Moderate (Yellow) |
51 |
| Kershaw |
Good (Green) |
48 |
| Lancaster |
Moderate (Yellow) |
54 |
| Laurens |
Moderate (Yellow) |
51 |
| Lee |
Good (Green) |
44 |
| Lexington |
Good (Green) |
48 |
| Marlboro |
Good (Green) |
44 |
| McCormick |
Good (Green) |
44 |
| Newberry |
Good (Green) |
48 |
| Oconee |
Moderate (Yellow) |
51 |
| Pickens |
Moderate (Yellow) |
51 |
| Richland |
Good (Green) |
48 |
| Saluda |
Good (Green) |
48 |
| Spartanburg |
Moderate (Yellow) |
51 |
| Sumter |
Good (Green) |
48 |
| Union |
Moderate (Yellow) |
51 |
| York |
Moderate (Yellow) |
54 |
| GA-Columbia |
Good (Green) |
44 |
| GA-Richmond |
Good (Green) |
44 |
| * Ozone forecasts are not issued for counties not listed in this table.
|
| AQI Color Code (Value) |
Cautionary Statement |
|
Good
(0-50)
|
No health effects are expected.
|
|
Moderate
(51-100)
|
Unusually sensitive people should consider limiting prolonged outdoor exertion.
|
|
Unhealthy for Sensitive Groups
(101-150)
|
The following groups should limit prolonged outdoor exertion:
- People with lung disease, such as asthma
- Children and older adults
- People who are active outdoors
|
|
Unhealthy
(151-200)
|
The following groups should avoid prolonged outdoor exertion:
- People with lung disease, such as asthma
- Children and older adults
- People who are active outdoors
Everyone else should limit prolonged outdoor exertion.
|
|
Very Unhealthy
(200+)
|
The following groups should avoid all outdoor exertion:
- People with lung disease, such as asthma
- Children and older adults
- People who are active outdoors
Everyone else should limit outdoor exertion.
|
