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First of all, a dust mask is has a single strap that goes over the head and provides very little protection from particles and debris in the air. They're also called nuisance dust masks and they're best used for mild applications like leaf blowing and general household dust protection. Dust masks just don't provide a good face seal and they protect about as well as nose hair, which is to say not that well. Replace them when they look dirty or after about 8 hours of wear. Honestly they're n …