A gas mask's 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. Some gas masks are also respirators, though the word gas mask's often used to refer to military equipment (for example Field Protective Mask, etc.) (The user of the gas mask isn't protected from gas that the skin can absorb.) Airborne toxic materials may… (More on Gasmask)