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

The protective ozone layer lies in the stratosphere, roughly 15 to 35 kilometres above the surface.

The troposphere is the lowest layer where weather occurs, not where the ozone shield sits.

The mesosphere lies above the ozone layer and hosts no such concentration.

The ionosphere is a charged region far higher up, unrelated to ozone shielding.

Stratospheric ozone absorbs most harmful ultraviolet radiation from the sun.

This absorption also warms the stratosphere with height.