- "These creatures clearly use the fog as a predatory device."
"Which I'm guessing explains the gas masks back at the lab."
"God knows what the prolonged exposure to this mist could do to us." - ―Dr. Carson Beckett and Major Anne Teldy[src]
A gas mask is a mask worn over the face to protect the wearer from inhaling "airborne pollutants" and toxic gases. The mask forms a sealed cover over the nose and mouth, but may also cover the eyes and other vulnerable soft tissues of the face.
Michael Kenmore wore such a mask when experimenting with his hybrids as they secreated a strange fog-like substance. (SGA: "Whispers")