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).