Watch where you are going there is a strange contaminant in the air. Better put on the Biohazard Gas 2018 Halloween Masks before you head to the party. This doomsday prep item can be used with many different outfits. Wear it to a zombie apocalypse nuclear doomsday or while making meth. We've got you covered for all three. It won't protect you from actual biohazards but you can pretend it will.