Published by DG XII of the Commission of the European Communities "Chemistry in the Atmosphere. A strategy for European research into global environmental issues" introduces current research in the field of atmospheric chemistry and explains its usefulness and purpose. The global environmental problems causing most concern are climate change and depletion of the ozone layer. Atmospheric chemistry is central to these problems, as well as to regional problems such as acid deposition and urban pollution. Small changes in the release of some gasses can have unexpected and long-lasting effects; complex chains of chemical reactions in the atmosphere are involved. Atmospheric chemistry encompasses the study of these complex sets of reactions, of which a thorough understanding is needed to provide a sound basis for regulatory policies. "Chemistry in the Atmosphere" explains present uncertainties in the understanding of: - Stratospheric ozone depletion; - The current oxidizing capacity of the atmosphere and how this capacity might change; - Natural and man-made aerosols and their effects on global climate; - The importance of natural emissions. This 33-page illustrated publication goes on to set out the requirements for an effective and comprehensive study of atmospheric chemistry. The body of the text explains the priority issues plus their significance for environmental policies. The book was prepared by the Science Panel on Atmospheric Chemistry and the Task Force Stratospheric Ozone, both groups being constituted to provide advice to the Commission regarding its atmospheric research action within the Environmental Division of DG XII, after consultation with other specialists within the European scientific community. Much wider consultation is expected in the development of the implementation of the strategy.