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The Iron and Steel Complex processes handle, store and undertake important amounts of raw materials (iron ores, coals, etc.) energy, fuels, waste waters, slags and other different types of wastes. These activities have an important environmental impact; therefore significant amounts of pollutants (gases, waste waters and wastes) are resulted. In case of accidents involving emission of pollutants in the atmosphere, health authorities and local administrations often need to know what areas could be affected by dangerously high pollutant concentrations. The goal of the paper is to evaluate a ready-to-use and modelling system, including meteorological parameters and a dispersion model using FLUENT® 6.3, a flexible software and reliable to be used for such real-time evaluations, especially for trans-border regions.