Oxygen was a gas that many species in the galaxy breathed to survive. Notable exceptions included the Kel Dors, the Gand, and the Morseerians. Planets with oxygen-rich atmospheres, referred to as "Type I atmospheres", included Naboo, Tatooine, and Coruscant, among many others.
- A New Dawn
- "Last Call at the Zero Angle"—Star Wars Insider 156 (Mentioned only)
- "The Perfect Weapon"
- (First identified as Oxygen)
- Star Wars in 100 Scenes
- Star Wars: Absolutely Everything You Need to Know
- Star Wars: Rey's Survival Guide
- Star Wars: Aliens of the Galaxy