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Burning and thermal degradation of wood are the sources of contamination of environment by carbonyl compounds. Many com pounds from this group are toxic and have negative influence on human and environment. The paper presents results of research of carbonyl compounds arising at thermal loading of various wood species at various conditions of thermal loading. The samples of beech, fir, spruce and birch wood were thermal loaded at temperatures 135, 170, 205, 240, 270, 450 and 600 В°C. The carbonyl compounds were ana...