Ozone/Legends

Ozone is a triatomic oxygen molecule that can be created by excess energy in the air, often caused by the firing of laser and blaster weapons. The gas has an odor that is pungent and noticeable, but the gas itself is colorless much like the diatomic oxygen that most humanoids breathe.

Many planets have a layer of ozone in their upper atmospheres; Roon is one such example. This ozone restricts ultraviolet light's ability to pass freely to the surface of the planet. Some planets, such as Af'El, lack ozone in their atmosphere. On Af'El, the native species known as the Defel adapted to cope with this by seeing in the ultraviolet spectrum of light.

Appearances

 * Cantina Communications
 * Star Wars Episode III: Revenge of the Sith novel