Foreword / O. Clifton Taylor -- Introduction / P.R. Miller and J.R. McBride -- Sect. 1. Description of Soils, Climate, Natural Resources, and Their Modification by Anthropogenic Influences. 1. Geography, Geology, Geomorphology, and Forest Soils / M.A. Poth and P. Wohlgemuth. 2. Climatology / F.M. Fujioka, J.O. Roads and S.-C. Chen. 3. Vegetation, Fire Regimes, and Forest Dynamics / Richard A. Minnich -- Sect. 2. Effects of Ozone and Other Air Pollutants on Vegetation and Soils in the San Bernardino Mountains. 4. Ambient Air Quality at Barton Flats and Other California Forests / John G. Watson, Judith C. Chow and Clifton A. Frazier [and others]. 5. Visibility Impairment in the San Bernardino Mountains / S. Copeland. 6. Physiological Responses of Ponderosa Pine to Gradients of Environmental Stressors / N.E. Grulke. 7. Temporal Changes in Crown Condition Indices, Needle Litterfall, and Collateral Needle Injuries of Ponderosa and Jeffrey Pines / P.R. Miller and J. Rechel. 8. Air Pollution Effects on Growth of Ponderosa Pine, Jeffrey Pine, and Bigcone Douglas-Fir / M.J. Arbaugh, D.L. Peterson and P.R. Miller. 9. Effects of Ozone on Understory Vegetation in the Mixed Conifer Forest / Patrick J. Temple. 10. Epiphytic Lichens in the San Bernardino Mountains in Relation to Oxidant Gradients / T.H. Nash III and L.L. Sigal. 11. Wet and Dry Pollutant Deposition to the Mixed Conifer Forest / A. Bytnerowicz, M.E. Fenn and P.R. Miller [and others]. 12. Direct Effects of Nitric Acid on Forest Trees / A. Bytnerowicz, P. Padgett and K. Percy [and others]. 13. Nitrogen Deposition and Cycling in Mediterranean Forests: The New Paradigm of Nitrogen Excess / M.E. Fenn and M.A. Poth -- Sect. 3. Interactions of Physical, Chemical, and Biological Factors and Their Influences on Forest Health and Forest Use. 14. Insects and Pathogens in a Pollution-Stressed Forest / J. Pronos, L. Merrill and D. Dahlsten. 15. Impact of Oxidant Air Pollutants on Forest Succession in the Mixed Conifer Forests of the San Bernardino Mountains / Joe R. McBride and Richard D. Laven. 16. Simulated Effects of N Deposition, Ozone Injury, and Climate Change on a Forest Stand in the San Bernardino Mountains / M.J. Arbaugh, D.W. Johnson and W.M. Pulliam. 17. Human Aspects of Air Quality in the San Bernardino Mountains / P.L. Winter -- Sect. 4. Synthesis and Conclusions. 18. Assessment of Ecological Risks and Implications for Policy and Management in the San Bernardino Mountains / P.R. Miller and J.R. McBride. 19. Implications of Chronic Air Pollution in the San Bernardino Mountains for Forest Management and Future Research / J.R. McBride and P.R. Miller.