Write the essential function performed by ozone at the higher levels of the Earth's atmosphere? How is it produced ? Name the synthetic chemicals mainly responsible for the drop of amount of ozone in the atmosphere. How can the use of these chemicals be reduced ?

Explanation

It shields the surface of the earth from the UV radiation from the sun.
`O_(2) overset(UV) to O + O`
`O_(2) + O to O_(3) ` {or description of this process in words}.
Chlorofluorocarbons (CFC.s)
Reduce the use of CFC.s by (a) minimizing the leakage through air conditioners and refrigerators/ finding substitute chemicals that are ozone friendly.
Detailed Answer :
Ozone protects the surface of earth from harmful ultraviolet (UV) radiations emitted by the sun. Ozone is a product of UV radiation acting on oxygen `(O_(2))` molecule. The higher energy UV radiations split apart some molecular oxygen `(O_(2))` into free oxygen (O) atoms. These atoms combine with molecular oxygen to form ozone.
`O_(2) overset(UV) to O + O`
` O + O_(2) to underset("(Ozone)")(O_(3))`
Chlorofluorocarbons (CFCs) are mainly responsible for the drop of amount of ozone in the atmosphere. Use of these chemicals can be reduced by using alternate products that do not harm the ozone layer. Also, safe disposal of old appliances like refrigerators prevents its emission.