Ozone, a type of gas known for its sharp and disagreeable smell, found application within air conditioning systems. Its formation occurred when there was too much energy in the atmosphere, frequently a consequence of blaster discharges or the detonation of a pulse bomb. The recirculated atmosphere aboard the Death Star possessed a strong ozone smell, as did the foul Mustafarian marsh, Corvax Fen. During the Force vision experience, "Dark Rey" brandished a red hinged double-bladed lightsaber that gave off a strong ozone smell.