Abstract: The invention relates to biological defense masks, and more particularly, biological defense masks designed for use by populations at risk of widespread biological attack via biological weapons of mass destruction. The present invention is also related to methods for using such biological defense masks wherein meteorological data is used to issue advisories with regard to the use of such biological defense masks to a population at risk of biological weapons of mass destruction.

Abstract: The invention utilizes a chemical/biological hood with a filter-blower system that is attached to the chemical/biological hood. The filter-blower system provides overpressure to the hood only. The hood is fitted to or attached to a chemical/biological mask. Overpressure created by the filter-blower around the mask is created and is independent of the wearer's respiration so that over-breathing of the positive pressure is not possible. Typically this system would be available as a hood capable of providing enhanced protection. However, the filter-blower and hood system could be integrated with the mask. Cinching or sealing the hood at the neck can improve overpressure performance.

Abstract: The invention relates to biological defense masks, and more particularly, biological defense masks designed for use by populations at risk of widespread biological attack via biological weapons of mass destruction. The present invention is also related to methods for using such biological defense masks wherein meteorological data is used to issue advisories with regard to the use of such biological defense masks to a population at risk of biological weapons of mass destruction.