Occurrence of atmospheric acidity (E. Meszaros). Sources of atmospheric acidity (A.G. Clarke). SO2 and NOx oxidation mechanisms in the atmosphere (M. Radojevic). The long-range transport of atmospheric acidity (B.E.A. Fisher). Deposition of atmospheric acidity (B.E.A. Fisher). Measurement methods for atmospheric acid deposition (J.M. Waldman, J.W. Munger and D.J. Jacob). Field studies of cloud chemical processes leading to acid deposition (T.W. Choularton). History of atmospheric acidity (P. Brimblecombe). Health effects of atmospheric acidity (M. Lippmann). Effects of acidic pollutants on terrestrial ecosystems (D. Fowler). Effects of aquatic ecosystems (S.J. Ormerod). Corrosion (G.O. Lloyd and R.N. Butlin). Effects of visibility, weather and climate (H. Horvath). Technologies of control (R.M. Downer and M. Radojevic). Legislative measures of control (D.J. Hughes). Strategies for controlling acid rain: economic considerations (B.A. Forster and T.D. Crocker). Acid pollution and public policy: the changing climate of environment decision-making (A. Irwin).