What is the ozone layer?
The ozone layer is a region of the stratosphere rich in ozone that absorbs some harmful solar ultraviolet radiation.
How it works and what the evidence shows
Core idea Solar UV can split oxygen molecules, and the resulting atoms can combine with oxygen molecules to form ozone. Ozone is also broken down by light, creating a dynamic balance. Evidence and research Satellites and ground instruments track stratospheric ozone. Certain chlorine- and bromine-containing substances accelerated depletion, prompting international restrictions.
Uses and limitations
Why it matters The layer reduces harmful UV exposure. Ozone near the ground is an air pollutant; the same molecule has different effects depending on its location. Common misunderstandings Ozone depletion and greenhouse-gas-driven climate change are different problems. They can interact but have different causes and responses.