The hazard
Dust, fumes, mists, gases and vapors can damage your lungs, sometimes without any warning you can see or smell. Controlling the hazard at the source comes first, with ventilation, water or a safer product. When a respirator is still needed, it only protects you if it is the right type, fits your face and is worn and cared for the right way.
The action
Your employer must select a respirator based on the hazards you are exposed to and the workplace and user factors that affect how well it works. A dust mask is a particle filter, so it does not protect you from gases or vapors, like solvent or paint vapors. If the product, the task or the air changes, ask before you keep using the same respirator. (29 CFR 1910.134(d)(1)(i))
ASK THE CREW
When were you last fit tested, and on which respirator model and size?
From the talk: Respiratory protection. Read it in full, free, with the questions and the sign-in sheet.