HEPA respirators bite the dust! So do dust masks.
D002487:Centers for Disease Control and Prevention, U.S.; D002568:Certification / Q000592:standards; D004867:Equipment Design; D017408:Guidelines as Topic; D006801:Humans; D008397:Masks / Q000592:standards; D009314:National Institute for Occupational Safety and Health, U.S.; D016272:Occupational Health / Q000331:legislation & jurisprudence*; D012134:Respiratory Protective Devices / Q000592:standards*; D014376:Tuberculosis / Q000517:prevention & control / Q000635:transmission; D014481:United States; D014489:United States Occupational Safety and Health Administration