Depending on the technology and the final temperature of the process, the yield is 29-32% from the oven dry mass of sleepers or 23-29% from oven dry mass. The highest combustion heat of such charcoal is 29.8-33.7 MJ/kg, while the ash content from the charcoal oven dry mass is 1.5-2.4%. In sanitary terms, charcoal is applicable also in household, because the content of the non-degraded benzo(a)pyrene in it does not exceed 4 mg/kg. However, from the ecological point of view, attention should be focused on the elevated content of different metals in charcoal ashes, namely, the content of arsenic, chromium and iron is 1.4, 9.3 and 33.8 times higher in comparison with untreated wood. The amount of copper, cobalt, cadmium, lead and mercury in the ashes does not differ from the control. Therefore, the use of ashes in composts would not be permissible. The sulphur content in charcoal is only 0.03-0.05% from the oven dry mass of charcoal.