Waste based on wood and poly(vinyl chloride) were thermally processed. The combustion products were analyzed to det. elemental compn., calorific value and contents of flammables, volatiles and ash. Emission indexes of individual exhaust gases and heavy metals as well as harmfulness of the combustion gases from the tested wastes with respect to their masses were estd. Wood wastes were more harmful to the environment due to much higher values od CO2 and SO2 emission.