Airsphere

You creat a mobile 20-foot radius sphere of fresh breathable air if your home world around you. For the duration, the air retains it's spherical shap and pushes back any air or liquid. When this spell ends, the air continues to exist but follows natural laws again.
While concentrating on the sphere, the caster can move the sphere up to 90ft as a bonus action. When you begin your turn with the spher outside of the spells range, concentration is broken and the air starts to obey natural laws again.