The aim of this final thesis is to process the issue containing transport of hazardous materials by road and the possibility of causing emergency situations linked to leakage of aqueous-ammonia into natural environment, that requires complex intervention of joint rescue service during real-time atmospheric conditions on the place of leakage. In the first part is described the current legislation of transporting hazardous materials, the method of marking transport units in the individual countries of the world and the possibilities of material leakage. The second chapter consists of the aim of the final thesis and a short description of its achieving. The third part characterizes the parameters and behaviour of selected material, the circumstances of traffic accidents and the characteristics of the possible place of leakage and factors influencing the spread of material during leakage. The last chapter describes the resulting model of hazardous material leakage and characterizes individual zones of threat. The course of events since the inception of traffic accident to its elimination of consequences gives us the picture of real-time intervetion of particular joint rescue service unit. Also in this chapter are described the facts, that were detected during the development of this final thesis and also recommendations for practical use.