The ozone layer is a region of our atmosphere that absorbs most of the sun's harmful radiation. Without the ozone layer, Earth wouldn't be able to support living organisms.
The ozone layer is located in the stratosphere, about 15 miles from the earth's surface. Ozone gas in the layer is a buffer between us and the powerful ultraviolet radiation produced by the sun. Over time, chemicals used by people have caused the ozone layer to become dangerously thin in spots, allowing more UV rays to penetrate. Thanks to global climate action, the ozone layer has begun to repair itself, and will likely recover to 1980s levels by the 2040s.