The Baltic Sea is one of the most heavily trafficked seas in the world. Ships traffic account for 15% of the world’s cargo transportation. Both the number and the size of ships have grown in recent years and this trend is expected to continue. The main environmental effects of shipping and other activities at sea include air pollution, illegal deliberate and accidental discharges of oil, hazardous substances and other wastes, and the unintentional introduction of invasive alien organisms via ships’ ballast water or hulls. The main fields of applying simulators in anti-pollution research are: Real time accidents simulations to anticipate their possible effects and improve anti-pollution actions (it is necessary to know the current weather conditions for this type of simulations); Oil spill forecast for predicted accident positions (medium/ extreme seasonal weather conditions should be used for these type of simulations), recorded data can be used to optimize costs and response resource allocation; Backtracking - to determine which vessel that caused an oil spill based on AIS-data and recorded pollution and reconstruction of oil pollution spreading; Staff training to improve the coordination of rescue operations in order to optimize local contingency planning.