The ozone layer, which protects us from harmful ultraviolet radiation, is situated in:

The protective ozone layer lies in the stratosphere, roughly 15 to 35 km up, where it screens out harmful ultraviolet rays.

The troposphere is the lowest layer where weather occurs, and ozone here is a harmful surface pollutant rather than a shield.

The mesosphere sits above the stratosphere and is where most meteors burn up, holding little ozone.

The ionosphere is a high, electrically charged region that reflects radio waves and plays no role in ozone shielding.

Stratospheric ozone forms when ultraviolet light splits oxygen molecules that then recombine into ozone.

This layer absorbs most of the Sun's biologically damaging UV-B and UV-C radiation.