Urban Air Pollution and Forests

Section 1. Past and Present Environmental and Sociological Factors Affecting Forests in the Mexico City Air Basin.- 1. Historical Summary of the Geology, Climate, Hydrology, Culture, and Natural Resource Utilization in the Basin of Mexico.- 2. Socioeconomic Change and Its Impact on Forest Resources in the Basin of Mexico.- 3. Physical Geography, Hydrogeology, and Forest Soils of the Basin of Mexico.- 4. Forests in the Basin of Mexico: Types, Geographic Distribution, and Condition.- 5. The Climate of the Mexico City Air Basin: Its Effects on the Formation and Transport of Pollutants.- Section 2. Air Pollution in the Mexico City Air Basin.- 6. Air Pollution Levels and Trends in the Mexico City Metropolitan Area.- 7. Emissions Trends and Pollution Control Strategies in the Mexico City Metropolitan Area.- 8. Heavy Metals in Forest Soils, Vegetation, and Drainage Waters in the Basin of Mexico.- Section 3. Ecological Effects of Air Pollutants in the Mexico City Air Basin: Case Studies.- 9. Oxidant Exposure and Effects on Pines in Forests in the Mexico City and Los Angeles, California, Air Basins.- 10. Decline of Sacred Fir in the Desierto de los Leones National Park.- 11. Histological Symptoms of Air Pollution Injury in Foliage, Bark, and Xylem of Abies religiosa in the Basin of Mexico.- 12. Lichens and Air Pollution in the Forests Surrounding Mexico City.- 13. Nitrogen and Sulfur Deposition in the Mexico City Air Basin: Impacts on Forest Nutrient Status and Nitrate Levels in Drainage Waters.- 14. Effects of Oxidants in Ambient Air on Annual Crops in the Basin of Mexico.- Section 4. Summary, Synthesis, and Perspectives.- 15. Summary of Air Pollution Impacts on Forests in the Mexico City Air Basin.- 16. Resources at Risk and Research Needs.