In search of spatial extremes - discussion, A. Stein, K.F. Turkman, et al; operational evaluation of air quality models - discussion, P.D. Sampson and P. Guttorp; general discussion I; assessing the human health risk of atmospheric particles, R.L. Smith, J.M. Davis and P. Speckman; Ozone dose mapping and the utility of models - discussion, C.W. Anderson and R.I. Smith; general discussion II; measuring and modelling pollution for risk analysis - discussion, J.V. Zidek and N.D. Lee; a preliminary statistical examination of the effects of uncertainty and variability on environmental regulatory criteria for ozone - discussion, L.H. Cox, P. Guttorp, et al; statistics and environmental policy - case studies from long-term environmental monitoring data - discussion, R. Gouday and G. Laslett; better late than never? injecting statistical know-how into legislation on water quality - discussion, A.E. Warn; general principles III - setting quality standards, principles of sampling; indicator quality for multidisciplinary systems, J. Riley; integrating data for sustainable development - introducing the distribution of resources framework - discussion, J. Heycox; does environmental data collection need statistics? - discussion, M.P.J. Pulles; air pollution statistics in policy applications - discussion, R.I. Smith; agriculture sector resource and environmental policy analysis - an economic and biophysical approach - discussion, R.M. House, H. McDowell, et al; final discussion.