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Ozone Layer
The ozone (O3) layer which is part of Earth's stratosphere, screens out harmful wavelengths of UV light. It is about 9 to 18 miles above the surface of the Earth (15 to 30 km).
Source
Source
Further reading:
https://www.iema.net/resources/news/2009/07/06/ozone-layer-recovery-may-be-delayed-by-ghg-emissions-study-says
https://www.iema.net/resources/news/2010/09/17/global-efforts-halt-depletion-of-life-preserving-ozone-layer-un-reports
