Question

what are reason for depletion in ozone layers

Answer 1

there is a increase in the gases on our earth which is directly effect to depletion of ozone layer

Answer 2

The reasons for depletion of ozone layer are as follows:
Use of chemicals like CFCs(ChloroFluoroCarbons) In sprays,refrigerators,etc,,..
Burning of fossil fuels
Increase in green house gases like co2
Heating of Earth causes hise in earths temperature