• No health effects are expected.

• Unusually sensitive individuals may experience respiratory effects from prolonged exposure to ozone during outdoor exertion.

What can I do to protect my health?

• When ozone levels are in the "moderate" range, consider limiting prolonged outdoor exertion if you are unusually sensitive to ozone.

• If you are a member of a sensitive group,⁽¹⁾ you may experience respiratory symptoms (such as coughing or pain when taking a deep breath) and reduced lung function, which can cause some breathing discomfort.

What can I do to protect my health?

• If you are a member of a sensitive group,⁽¹⁾ limit prolonged outdoor exertion. In general, you can protect your health by reducing how long or how strenuously you exert yourself outdoors and by planning outdoor activities when ozone levels are lower (usually in the early morning or evening).
   
• You can check with your State air agency to find out about current or predicted ozone levels in your location. This information on ozone levels is available on the Internet at http://www.epa.gov/AIRNow.

• If you are a member of a sensitive group,⁽¹⁾ you have a higher chance of experiencing respiratory symptoms (such as aggravated cough or pain when taking a deep breath), and reduced lung function, which can cause some breathing difficulty.
   
• At this level, anyone could experience respiratory effects.

What can I do to protect my health?

• If you are a member of a sensitive group,⁽¹⁾ avoid prolonged outdoor exertion. Everyone else-especially children-should limit prolonged outdoor exertion.
   
• Plan outdoor activities when ozone levels are lower (usually in the early morning or evening).
   
• You can check with your State air agency to find out about current or predicted ozone levels in your location. This information on ozone levels is available on the Internet at http://www.epa.gov/AIRNow.

• Members of sensitive groups⁽¹⁾ will likely experience increasingly severe respiratory symptoms and impaired breathing.
  
   
• Many healthy people in the general population engaged in moderate exertion will experience some kind of effect. According to EPA estimates, approximately:
  - Half will experience moderately reduced lung function.
  - One-fifth will experience severely reduced lung function.
  - 10 to 15 percent will experience moderate to severe respiratory symptoms (such as aggravated cough and pain when taking a deep breath).
  
   
• People with asthma or other respiratory conditions will be more severely affected, leading some to increase medication usage and seek medical attention at an emergency room or clinic.

What can I do to protect my health?

• If you are a member of a sensitive group,⁽¹⁾ avoid outdoor activity altogether. Everyone else—especially children—should limit outdoor exertion and avoid heavy exertion altogether.
  
   
• Check with your State air agency to find out about current or predicted ozone levels in your location. This information on ozone levels is available on the Internet at http://www.epa.gov/AIRNow.