Polish industrial plants with protective zones delimited in the past, have been faced with the necessity to liquidation of these zones before 2005. At the same time the plants must not cause any harmful influence over environment outside the area which they have title deed to. Determination of the current range of this impact is very important due to the high costs of a possible purchase of land exposed to the harmful effects. The study analyzes the possibility of verifying the course of borders two existing protective zones: around Katowice Steelworks and Coking Plant "Przyjaźń" in Dąbrowa Górnicza (the first zone) as well as T. Sendzimir Steelworks in Kraków (the second one). As a base of the verification was reduction of air pollutant emissions and the area with exceeded permissible concentrations of pollutants in the air or deposition of particulate matter on the land surface. Significant decreasing of the harmful influence of air emissions from these facilities was confirmed by the results of atmospheric dispersion modeling.

English title: An analysis of liquidation possibility of protective zones around selected metallurgical and coke and chemical industry plants.