Air was one of the six primary elemental powers in the Matoran universe. It was associated with the color green and the Matoran prefix le. Beings with the elemental power of air, such as Toa of Air, possessed various air-related abilities, including summoning gusts of wind, creating cyclones, controlling air currents to assist in gliding or flying, controlling air pressure, and creating vacuums. It could be combined with the elemental power of water to create thunderstorms. Matoran of Air were called Le-Matoran.
Air did not have structure on its own, but Toa of Air often gave it structure.
Vacuum was essentially a special Air power.
A Toa of Air could control air pressure.
As a rule, Toa of Air were free spirits.
- Greg Farshtey didn't see the point in making vacuum a Toa element when Toa of Air could already create it as part of their powers.