Ultraviolet rays from Sun Chlorofluorocarbons The Ozone layer in are entering in to stratosphereatmosphere releasing blocks thesechlorine. The chlorine harmful UV rays than break down the ozoneOxygenozoneWhole in Ozone layerchlorine The chlorine released from CFCs break down the ozone molecule.More ultraviolet radiations are reaching in to earths surface as there is a whole in ozone layer.