Abstract: The present invention relates to a method of removing mercury-containing contaminations in gases by passing the gas to be purified through a filter bed which is devised to make the gas contact effectively. The method is characterized in that, the filter bed is consisted of specific material prepared by binding onto a carrier substance such as granulated pumice, with sulfurous substance as contamination absorbing agent, such as natural sulfide minerals subjected to a surface activation pretreatment, synthetized metal sulfides and sulfur.According to the present invention, it is intended to remove contaminations in gases, especially those containing vaporized mercury together with adsorption on the filter bed material, in such a mechanism that mercury, which has a high vapor pressure, is converted into its sulfide, which shows very low vapor pressure, by contacting the gas with sulfides of other metals or with sulfur.