Why is zack from ghost adventures wearing a gas mask in goldfield,NV?

In the Ghost Adventures episode where the crew investigates the Goldfield Hotel, Zak wore a black face mask (respirator). He explained he had endured recent respiratory illness probably caused by the black mold and asbestos found in many of the derelict locations their team investigated.

Zak also tweeted the reason why he always wear a respirator:

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Have you been inspired by the GAC? Here are some top tips for ghost hunting beginners offered by UKTV- Really.

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