Question

How ozone is formed in the upper atmosphere? Why is damage to ozone layer a cause of concern to us? What causes this damage?

Answer 1

Heya...

Ozone at the higher levels of the atmosphere is a product of UV radiation acting on oxygen molecules.
The higher energy UV radiations split apart some molecular oxygen into free oxygen atoms.
These atoms then combine with the molecular oxygen to form ozone.

Damage to ozone is a major concern because :
Ozone protect the earth surface from harmful ultraviolet rays of the sun, which when come in contact can cause skin cancer.

This damage is caused by synthetic chemicals like CFC (chlorofluorocarbons) which are used in refrigerators.

Hope this helps you...

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Answer 2

#Stratospheric ozone is formed naturally by chemical reactions. In the first step, solar ultraviolet radiation breaks apart one oxygen molecule (O2) to produce two oxygen atoms (2 O). In the second step, each of these highly reactive atoms combines with an oxygen molecule to produce an ozone molecule (O3). These reactions occur continually whenever solar ultraviolet radiation is present in the stratosphere. As a result, the largest ozone production occurs in the tropical stratosphere. 
#Stratospheric ozone is considered good for humans and other life forms because it absorbs ultraviolet- B (UV-B) radiation from the Sun . If not absorbed, UV-B radiation would reach Earth’s surface in amounts that are harmful to a variety of life forms.
#The initial step in the depletion of stratospheric ozone by human activities is the emission, at Earth’s surface, of gases containing chlorine and bromine. Most of these gases accumulate in the lower atmosphere because they are unreactive and do not dissolve readily in rain or snow. Natural air motions transport these accumulated gases to the stratosphere, where they are converted to more reactive gases. Some of these gases then participate in reactions that destroy ozone. Finally, when air returns to the lower atmosphere, these reactive chlorine and bromine gases are removed from Earth’s atmosphere by rain and snow.