Clean Air

You create a 20 foot sphere of pure air that removes all poison, fog, or other harmful air effects. This allows you to breathe where it would otherwise not be possible. This will not destroy water or materials. The spell effect ends if the radius is filled.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the radius of the pure air increases by 20 feet for each slot level above 2nd.