Gas masks protect people from toxic and airborne pollutants. Most gas masks are also called respirators, and form a sealed cover for the mouth and nose. Though they are generally used in military settings, they are also suitable for personal use, and are available for many mobile devices. A good gasmast can protect you from harmful NBC agents, and is compatible with a wide range of different devices. This app is available in different versions, so it is easy to find the perfect one for your device.