For 5/23/2025
[ The forecast is updated daily by 3:30 pm EDT. ]
Hourly ground level ozone concentrations are mostly in code Green, with several code Yellow readings in the coastal plain, on this Thursday afternoon. Another cold front will continue to move through the state overnight tonight, pushing reinforcing cool and dry air into the region for Friday. Mostly sunny skies and dry air will result in prime conditions for ozone formation. Despite the strong flow behind the front helping to disperse ozone formation, along the coastline the weak sea breeze will converge with westerly flow and pin pollutants along the coast, while the Central Savannah River Area and Pee Dee zones will be downwind of the Atlanta plume and Columbia plume respectively. Thus, the Charleston Tri-County, Central Savannah River Area, and Pee Dee zones are forecasted to finish code Yellow, while the Midlands, Upstate, and Catawba zones are forecasted to finish code Green on Friday.
| County * |
Color Code |
AQI |
| Abbeville |
Good (Green) |
48 |
| Aiken |
Moderate (Yellow) |
51 |
| Anderson |
Good (Green) |
48 |
| Barnwell |
Moderate (Yellow) |
51 |
| Berkeley |
Moderate (Yellow) |
61 |
| Calhoun |
Good (Green) |
44 |
| Charleston |
Moderate (Yellow) |
61 |
| Cherokee |
Good (Green) |
48 |
| Chester |
Good (Green) |
49 |
| Chesterfield |
Moderate (Yellow) |
54 |
| Darlington |
Moderate (Yellow) |
54 |
| Dillon |
Moderate (Yellow) |
54 |
| Dorchester |
Moderate (Yellow) |
61 |
| Edgefield |
Moderate (Yellow) |
51 |
| Fairfield |
Good (Green) |
44 |
| Florence |
Moderate (Yellow) |
54 |
| Greenville |
Good (Green) |
48 |
| Greenwood |
Good (Green) |
48 |
| Kershaw |
Good (Green) |
44 |
| Lancaster |
Good (Green) |
49 |
| Laurens |
Good (Green) |
48 |
| Lee |
Moderate (Yellow) |
54 |
| Lexington |
Good (Green) |
44 |
| Marlboro |
Moderate (Yellow) |
54 |
| McCormick |
Moderate (Yellow) |
51 |
| Newberry |
Good (Green) |
44 |
| Oconee |
Good (Green) |
48 |
| Pickens |
Good (Green) |
48 |
| Richland |
Good (Green) |
44 |
| Saluda |
Good (Green) |
44 |
| Spartanburg |
Good (Green) |
48 |
| Sumter |
Good (Green) |
44 |
| Union |
Good (Green) |
48 |
| York |
Good (Green) |
49 |
| GA-Columbia |
Moderate (Yellow) |
51 |
| GA-Richmond |
Moderate (Yellow) |
51 |
| * 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.
|
