Studies suggest that the ozone layer will recover by 2050 if the guidelines in the Montreal Protocol are adhered to. Ozone molecules are consistently destroyed and replaced, so the amount of ozone is generally fairly stable. The problem occurs when ozone-depleting substances invade the ozone layer, which essentially widens the hole in the layer. We are not able to make new ozone, so the hole needs to be reduced to its natural size. This is achieved by reducing the amount of chlorine and bromine in the stratosphere. This, in turn, can only be achieved by ceasing the production of CFCs and other chemicals. The Montreal Protocol was enacted to aid the recovery of the ozone layer.
some previous answers address this:
Reports vary on the exact time frame necessary for the ozone layer to be repaired. Thanks to the Montreal Protocol, it is expected that tha majority of the world’s ozone layer will be back to pre-1980 levels by 2049. The severe hole over Antarctica, however, will take even longer to repair itself, being estimated to reach pre-1980 levels no sooner than 2065, according to a report released by the World Meteorological Organization and the United Nations Environmental Program.
According to NASA studies in 2009, ozone-depleting substances will not be at pre-1980 levels in the stratosphere until 2060 or so, but mid-latitude ozone layer may recover as early as 2025. Even so, recovery is complicated. The stratosphere ozone layer over tropical latitudes may not recover for over a century, and greenhouse gases may actually change the dynamics of the original ozone layer so it will never be quite the same. Some scientists are seeing a slower recovery than once predicted, throwing out figures in the late 2060s.
The answer is, we’re not totally sure, and because the ozone is multi-layered, it get complicated. See the links for more information.
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