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Water Quality and Contaminant Modeling Branch (WQCMB), Environmental Processes and Effects Division (EPED), Environmental Laboratory (EL), ERDC, was the study manager and ERDC technical point of contact. The hydrodynamic modeling portion of this study was conducted by Drs. Billy H. Johnson and Keu W. Kim of the Waterways and Estuaries Division (WED), of the ERDC Coastal and Hydraulics Laboratory (CHL), under the general supervision of Dr. William H.

The efficacy of powered air-purifying respirators, surgical masks, dust/mist respirators, and high-efficiency respirators were tested with a biological aerosol under simulated breathing conditions. Protective ability ranged from 67 to 99.95%. The majority of penetration in negative-pressure respirators occurred at the face-mask interface rather than through the filter material.