What is Ozone? Why is it Bad?
Ozone is a highly reactive gas that consists of three oxygen atoms. It has the same chemical structure whether it occurs miles above the earth or at ground level. Depending on its location in the atmosphere, ozone is considered either good or bad. Ozone is naturally occurring in the stratosphere and forms a layer that protects life on earth from the sun's harmful ultraviolet rays. The term "ozone hole" refers to a reduced concentration of ozone in the stratosphere. At ground