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A composite filtration media for removing broad spectrum toxic chemicals from streams of air comprised of a physical mixture of a zirconium hydroxide analog material and a basic gas removal material is taught in which the composite filtration media is prepared by blending the zirconium hydroxide analog material in powder form with the basic gas removal material in powder form before pressing into pellets, tablets, briquettes, or the like. Subsequent grinding of the pressed material can be employed to produce a powder form of the composite filtration media. Cross-reaction of the composite components is reduced, thus prolonging the service life of the filtration media. Effectiveness in removing ammonia and sulfur dioxide are demonstrated for various compositions of the composite filtration media in both dry and humid conditions, including after aging for three weeks in humid conditions.