The calculations of possible pollution zones of the surface by residual rocket fuel upon the fall of second stages of Proton carrier rockets launched from Baikonur Cosmodrome have been analyzed. The model developed was used to simulate the fall of an ensemble of unsymmetrical dimethylhydrazine (UDMH) drops in the atmosphere. Telemetric information on the descent trajectories of second stages of carrier rockets and input meteorological information obtained from Reanalysis (NCAR/NCEP) data were used.