Abstract
Case histories of the dispersal of chemicals released accidentally into the environment are reviewed with the purpose of developing strategies for assessing the ecological impact of chemical accidents. The range of accidents reported in the literature are diverse, as are the approaches used to follow up pollution events to assess ecological damage. The review classifies accidents according to the environmental components (atmospheric, aquatic, and terrestrial) that they pollute and the approaches for assessing damage to each of these components are discussed. From the literature reports of chemical accidents, it is clear that cohesive approaches must be developed for quantifying environmental contamination.Key words: Bhopal, chemical accidents and spills, environmental contamination, modelling pollution events, Seveso, Schweizerhalle.

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