air conjuration 

Traditions arcane, divine, primal

Cast [R] verbal; Trigger A creature within range enters an environment where it can't breathe.

Range 60 feet; Targets the triggering creature

Duration 1 minute

A bubble of pure air appears around the target's head, allowing it to breathe normally. The effect ends as soon as the target returns to an environment where it can breathe normally.

Core Rulebook, page 316.