Technology has been developed for the preparation of VION chemisorptive fibre containing chemically active groups, which are able to sorb substances of various chemical natures. The chemisorptive and mechanical properties of VION fibre do not change over the course of many sorption-regeneration cycles. As experience in operating industrial plants in a number of branch plants has shown, it is advisable to use chemisorptive fibrous materials as a filtering material for protection of the environment; these ensure a high rate and completeness of removal of harmful discharges as a result of their highly developed surface.