Abstract

On 20 March 1989 a very severe accident occurred at a chemical plant near the town of Ionava in Central Lithuania. We have estimated the atmospheric dispersion of ammonia released in the accident, focussing on the possible long-range effects. The computations were made using trajectory and dispersion models based on gradient-transfer diffusion theory, using actual meteorological data. The computed concentrations were compared with available observations, obtained from the European Monitoring and Evaluation Programme stations.

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