Computer modelling in groundwater protection and remediation (P.K.M. van der Heijde). Developments in computer technology enhancing the application of groundwater models (P.K.M. van der Heijde). A review of groundwater contaminant transport modelling techniques (T.V. Hiomadka II). Some recent advances in computer modelling of groundwater contaminant transport. Meterological modelling applied to regional air-quality studies using four-dimensional data assimilation (N.L. Seaman). Applications of photochemical models (T.W. Tesche). Acid deposition modelling (G.R. Carmichael and W.C. Shin). Photochemical oxidants in central Japan (G.R. Carmichael, W.-C. Shin, Y.-S. Chang, H. Kurita and H. Ueda). Some considerations of the role of the land/lake breeze in causing elevated ozone levels in the southern Lake Michigan region (W.A. Lyons, D.A. Moon, J.L. Eastman, C. S. Keen, N.R. Lincoln, R.A. Pielke and W.R. Cotton). Environmental modelling for emergency preparedness (A. Albergel, J. Moussafir, S. Pederell and J.Y. Cancill). Particle modelling and its application for simulating air pollution phenomena (P. Zannetti). Numerical simulation of the global warming (J.M. Oberhuber, F. Lunkeit, R. Sawen, B.D. Santer & U. Lubasch). The CO2 cycle and the impact of its peturbation by human activities. Numerical simulation of ocean circulation (J.M. Oberhuber). A multilevel model for the study of the dynamics of the North Adriatic Sea (G. Betello and A. Bergamasco). The modelling and simulation of ocean's circulation on supercomputers (J.M. Beckers). The prediction and control of water quality (D. Munro). Recent and future development in environmental modelling (S.E. Jorgensen). How to design or choose an environmental information system (E.G. Walther).