Sources of Acids Bases and Their Precursors in the Atmosphere. - I. Introduction and Definitions. - II. Sources of Acids. - III. Sources of Acid-Neutralizing Substances (Bases). - IV. Distribution of Atmospheric Acids and Bases. - V. Gas-Aerosol Equilibria and Boundary Layer Mixing. - VI. Summary of Significant Acid-Formation Pathways. - References. - Aerosol Sulfur Association with Aluminum in Eastern North America: Evidence for Solubilization of Atmospheric Trace Metals before Deposition. - I. Statement of the Problem. - II. Approach to the Problem. - III. Results. - IV. Discussion. - References. - Source-Receptor Relationships for Atmospheric Trace Elements in Europe. - I. Introduction. - II. Emission Patterns of Atmospheric Trace Elements in Europe. - III. Long-Range Transport Models for Trace Elements in Europe. - IV. Application of Statistical Methods in Source-Receptor Studies. - V. Recommendations for Further Research. - References. - The History of Atmospheric Deposition of Cd Hg and Pb in North America: Evidence from Lake and Peat Bog Sediments. - I. Introduction. - II. Methods. - III. Results. - IV. Summary. - References. - Dry Deposition of Particles and Vapors. - I. Introduction. - II. The Process of Dry Deposition. - III. Wind Tunnel Studies and Semiempirical Models. - IV. Measurement Methods. - V. Dry Deposition Data and Comparison with Model Predictions. - VI. Summary. - References. - Dry Deposition of Sulfur and Nitrogen Oxide Gases to Forest Vegetation. - I. Introduction. - II. Mechanisms of Dry Deposition of Gases. - III. Experimental Measurement of Deposition. - IV. Results of Measurements of Deposition. - V. Dry Deposition and the Response of Forests. - References. - Throughfall Chemistry and Canopy Processing Mechanisms. - I. Introduction. - II. Processes That Control Throughfall Chemistry. - III. Hypothesized and Observed Throughfall Fluxes. - IV. Future Research. - Appendix: Sequential Throughfall Sampling Methods. - References. - Abatement of Atmospheric Emissions in North America: Progress to Date and Promise for the Future. - I. Introduction. - II. Acidic Rain as a Political and Technical Issue. - III. Emission Patterns. - IV. Emission Reduction Approaches for SO2 and NOx. - V. Forecasting Future Emission Trends. - VI. Cost of Emission Reductions. - VII. Policy Options for Reducing Emissions. - References. Language: English