This book is about the atmosphere and our influence on its composition. The early chapters look at the geochemical, biological and maritime sources of the trace gases and are followed by chapters on the chemistry of atmospheric gases, suspended particles and rainfall. After dealing with the natural atmosphere the book examines the sources of air pollution and its effects: decline in health, damage to plants and animals, and to constructional materials, indoor pollution, acid rain and global changes in carbon dioxide and methane. The final chapters are concerned with the chemistry and pollution of the upper atmosphere and the composition and evolution of the atmospheres of the planets of the solar system.