According to NASA, thanks to an international treaty negotiated in 1987 that banned ozone-depleting chemicals, the Antarctic ozone hole will recover by 2075.
Ozone in the Earth’s atmosphere acts like sunscreen, blocking life from dangerous solar ultraviolet radiation. Human-made chemicals—especially chlorofluorocarbons (CFCs) used in aerosol spray cans and refrigerants—over many years depleted the planet’s ozone layer. The harmful effects of CFS were recognized in the early 1970s, and governments worldwide recognized their danger and negotiated the Montreal Project—an international treaty that banned ozone-depleting chemicals like CFCs.
According to NASA scientists, it worked. Since the mid-1990s the global ozone levels have stabilized. In addition, model simulations indicate that the Antarctic ozone hole will return to its pre-1980 levels around 2075.
Scientists used data from NASA’s Nimbus-4 Backscatter Ultraviolet instrument and Aura’s Ozone Monitoring instrument to help create the model simulations using its Goddard Earth Observing System Chemistry-Climate Model.