What is Ozone?

What does it mean when the weather reporter says it’s going to be a “bad ozone day”? Or when a doctor says that “sensitive groups” should avoid outdoor activities? Generalizations like these can be confusing and frustrating as you plan your day. But because our new real-time ozone maps give us better information about ozone, we now have better ways of determining exactly when and where ozone exposure is a real problem. You can track the movement of ozone clouds across the area as they form, and you can understand your actual exposure and do something about it. These warnings still raise important questions, however, such as “do I belong to a sensitive group?”; “why is ozone bad for me?” and “why is ozone bad sometimes and good other times?” You don’t have to be an atmospheric scientist to understand the basics, and to use the map to control your exposure.