Tightening of the European Union law in the field of the air emission limit values from waste incineration causes necessity for existing and new incineration plants to conform to the standards. It will often involve modernization of the flue gas cleaning system. Proposed in the paper the methodology of evaluation of the combustion gases composition in point of view cleaning difficulty should be useful to this end. Average toxicity factors for hazardous waste incineration flue gases were defined as well. Among other things they can be used in comparative analysis of the air pollutant concentration in the raw gas (before cleaning) and in flue gas emitted to the atmosphere during incineration of different types of waste in the same incinerator or incineration of the same wastes in different incinerators.

English title: Evaluation of the composition of flue gas from hazardous waste incineration in the field of cleaning difficulty and toxicity.