The ozone layer: where it is and why it matters
Most atmospheric ozone that protects life from harmful ultraviolet radiation is concentrated in the stratosphere.
Ozone absorbs much of the Sun’s biologically damaging ultraviolet radiation. The ozone layer is not a solid shell; it is a region where ozone concentration is relatively higher.
What the evidence says
Ozone-depleting substances and greenhouse gases are not identical categories, although some substances affect both ozone and climate. The Montreal Protocol created an international framework to phase out many ozone-depleting chemicals.
Exam note
For exam revision, retain the key definition and consult the linked primary source when a current rule or technical detail matters.
Editorial note
This article was researched and published with AI assistance. No human prepublication review is claimed. Report factual errors through our contact page.
Frequently asked questions
In which atmospheric layer is most protective ozone concentrated?
The stratosphere.