How is ozone formed in the stratosphere?
ozone is tri-atomic oxygen..In stratosphere,oxygen breaks into atomic oxygen due to the solar radiation and atmospheric pressure conditions.The atomic oxygen combines with atmospheric oxygen to form ozone. O2->O+O. O+O2->O3(ozone) Pollutants like CFCs are ChloroFluoroCarbons are light in weight and hence rise up to the stratosphere and attack ozone and results in the formation of chlorine atoms.These chlorine atoms are responsible for the degeneration of ozone molecules. CCl2F2->CClF2+Cl Cl+O3->ClO+O2 ClO+O3->2O2+Cl The chlorine atom is again regenerated and this chain reaction continues.It is estimated that one chlorine atom can destroy 100,000 ozone atoms in its lifetime.So CFCs are considered to be threatening even in small amounts. If you have anymore doubts,you can clarify with me.
