Understanding Ground-level Ozone Forecasts

South Carolina has had two forecasted Code Orange Ozone Action Days since Ground-level Ozone forecasting season began on April 1st of this year. A Code Orange Ozone Action Day means that atmospheric conditions will likely produce concentrations of ground level ozone air pollution that may be unhealthy for sensitive groups, which includes people with lung disease, older adults, and children.   

Ozone typically forms with highest concentrations on warm, hot, sunny days with light wind speeds, which allows more of the pollutant to form and accumulate. Forecasting ground-level ozone concentrations is an educated prediction based on certain weather conditions and emissions. DHEC has a team of experienced meteorologists on staff that review weather and air quality information daily to produce a next-day ozone forecast, which is posted on DHEC’s own ozone website and U.S. EPA’s AIRNow website. 

Knowing the Ground-level Ozone Forecast ahead of time allows you to make plans and adjust your schedule and activities for the next day. Sensitive groups should reduce prolonged or heavy outdoor exertion, take more breaks, and do less intense activities, especially during afternoon and early evening hours when ozone concentrations are typically highest. 

Knowing the Ground-level Ozone Forecastahead of time also allows you to make informed decisions that can help reduce air pollution and decrease ground-level ozone by:    

  1. Refueling your car after 6:00 PM and don’t top off your tank  
  2. Using electric powered lawn equipment  
  3. Avoiding driving during peak traffic hours  
  4. Combining trips when you drive  
  5. Telecommuting (work from home) if possible
  6. Taking your lunch to work  

Sign up to receive forecasts via emails, texts or tweets (customized to fit your style) using EPA’s free EnviroFlash service at www.enviroflash.info.  
For additional information about ozone and air quality, click here.   

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