Ozone was a triatomic oxygen molecule that was created by excess energy in the air, often caused by the firing of laser and blaster weapons, as well as the use of lightsabers. The gas had an odor which was pungent and noticeable. Ozone odors were also known to precede ion storms.

Many planets had a layer of ozone in their upper atmosphere; Roon was one such example. This ozone restricted ultraviolet light's ability to pass freely to the surface of a planet. Some planets, such as Af'El, lacked a layer of ozone in their atmosphere. On Af'El, the native Defel adapted to this by developing the ability to see in the ultraviolet spectrum of light.

The contact of a blaster bolt against a lightsaber resulted in the smell of ozone.^[1]

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I find your lack of sources disturbing. This article needs to be provided with more sources and/or appearances to conform to a higher standard of article quality.

• A Guide to the Star Wars Universe
• The Politics of Contraband
• Galaxy Guide 4: Alien Races, Second Edition
• Geonosis and the Outer Rim Worlds

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