I saw that line about safety crews insisting on respirators. Read a thing from a health site saying dust masks often let in fine particles during heavy cleaning. Like when you're dealing with mold or sweeping up construction debris, those tiny bits can get past a basic mask. A respirator seals better and filters out more harmful stuff. For light dusting, a dust mask is probably fine, but for bigger jobs, upgrading makes sense. It's about matching the gear to the real risk.