Ozone is a very active gas. When it is lower down in the atmosphere, it is closer to living things and can harm them. It can damage the leaves of plants and effect how they use sunlight to provide food. In humans it can cause headaches, eye irritation, coughs and chest discomfort.
Our behavior is the only thing over which we have absolute control to maintain good physical fitness positive choices made each day just by being healthy yourself. But it depends on your decisions. (I’m not fully sure if this is correct)