FIELD: breathing apparatuses. SUBSTANCE: filter medium for breathing apparatuses uses external and internal layers, and effective layer placed between them and consisting of fibrous polystyrene or chlorinated polyvinyl chloride, or their mixture, the fibre diameter being within 1 to 10 10-50 g/m2, air resistance-within 1 to 25 Pa at an air flow rate of 1 cm/S, and surface density-within 10 to 50 g/sq.m. EFFECT: enhanced efficiency. 6 cl, 1 dwg, 1 tbl
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