In the Ghost Adventures episode where the crew investigates the Goldfield Hotel, Zak wore a black face mask. He explained he had endured recent respiratory illness probably caused by the black mold and asbestos found in many of the derelict locations GAC investigated.
This is, by the way, a dust mask, not a gas mask. Gases will pass right through the mask, but fine particles of matter will be blocked, thus protecting his respiratory system from foreign particulate matter. The episode aired on January 14, 2011 and features the team returning to Goldfield, NV where they first started finding evidence of the paranormal.
View Ghost Adventures episode guide at Travelchannel.com.
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