Understanding our environment : an introduction to environmental chemistry and pollution Introduction Roy M. Harrison The atmosphere A.G. Clarke and A.S. Tomlin Freshwaters John G. Farmer and Margaret C. Graham The oceanic environment Stephen J. de Mora Land contamination and reclamation B.J. Alloway Environmental cycling of pollutants Roy M. Harrison Environmental monitoring strategies C. Nicholas Hewitt and Robert Allott Ecological and health effects of chemical pollution S. Smith Managing environmental quality Andrew Skinner