No matter how noxious or poisonous the fumes, you convert them to clean, breathable air. All the gases in a Close Burst 5 around you are purified. However, the toxic air around your bubble of clean air will quickly taint your bubble again, unless you Sustain the Spell. Make a Spellcasting skill check against a TN of 13.

• Success: You may Sustain this Spell.
• Failure: The spell may not be Sustained.