Approaches related to modeling chemical compound migrations in the environment are discussed. Models related to both closed and open systems in steady-state or non steady-state conditions are characterized. Methods of building the models and the review of the most important types of models with adequate examples, as well as the results possible to achieve using these groups of models are presented. The review also contains the division of models with respect to the way of presenting chemical transport, the complication level and the range of modeled area. Risk evaluation, abiotic and biotic approaches are discussed as well. Special attention was put on the complexity of abiotic models based on the fugacity concept.