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South Carolina Ground-level Ozone Forecast

For 6/20/2018

[ The forecast is updated daily by 3:30 pm EDT. ]

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Ozone concentrations on this hot Tuesday afternoon are trending solidly in the yellow category for the Catawba zone, while other zones are trending anywhere from code green to low code yellow. A hot ridge of high pressure aloft dominates the weather pattern through tomorrow (and beyond). It is acting to suppress much of our cloud development and afternoon convection. Thus, we expect mainly dry, sunny, and hot conditions again for tomorrow, along with a light wind regime. Fortunately, clean sourcing and humid conditions will curtail ozone production somewhat. Expect the highest concentrations to occur across the Catawba, Midlands, CSRA, and Pee Dee regions, where Code YELLOW is being forecast. The Upstate and Trident zones will be cleaner and code GREEN.
County * Color Code AQI
Abbeville Good (Green) 50
Aiken Moderate (Yellow) 61
Anderson Good (Green) 50
Barnwell Moderate (Yellow) 61
Berkeley Good (Green) 44
Calhoun Moderate (Yellow) 51
Charleston Good (Green) 44
Cherokee Good (Green) 50
Chester Moderate (Yellow) 74
Chesterfield Moderate (Yellow) 67
Darlington Moderate (Yellow) 67
Dillon Moderate (Yellow) 67
Dorchester Good (Green) 44
Edgefield Moderate (Yellow) 61
Fairfield Moderate (Yellow) 51
Florence Moderate (Yellow) 67
Greenville Good (Green) 50
Greenwood Good (Green) 50
Kershaw Moderate (Yellow) 51
Lancaster Moderate (Yellow) 74
Laurens Good (Green) 50
Lee Moderate (Yellow) 67
Lexington Moderate (Yellow) 51
Marlboro Moderate (Yellow) 67
McCormick Moderate (Yellow) 61
Newberry Moderate (Yellow) 51
Oconee Good (Green) 50
Pickens Good (Green) 50
Richland Moderate (Yellow) 51
Saluda Moderate (Yellow) 51
Spartanburg Good (Green) 50
Sumter Moderate (Yellow) 51
Union Good (Green) 50
York Moderate (Yellow) 74
GA-Columbia Moderate (Yellow) 61
GA-Richmond Moderate (Yellow) 61
* 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.