Where is ozone found in the atmosphere?
Ozone is formed by the action of sunlight on molecules of oxygen (O2) in the stratosphere. Thus, it is mainly concentrated in a layer at altitudes between about 10and 30 km above the earth’s surface. Some ozone can also be formed close to the earth’s surface by the action of sunlight on, for example car exhaust fumes. This low altitude ozone (a constituent of smog) can cause a health hazard if it is breathed in.
