A major environmental concern is the increasing burden on all scales of photo-oxidants, acidifying substances and potential nutrients in the troposphere. These lead to episodes of summer smog, and appreciable damage to eco-systems both on land and at sea. Underlying the environmental effects is the complex scientific problem of linking the man-made and biological emissions to the myriad chemical reactions that transform the pollutants as they are transported to and deposited in the surroundings and also pristine areas remote from the sources. The project, the scientific results of which are described in this book, was set up to study the problem in an inter-disciplinary way by co-ordinating the work of more than 150 research groups in some 20 countries.

I An Overview and Synthesis of the Scientific Results.- 1 EUROTRAC: Organisation, Structure
and Achievements.- 2 Photo-oxidants.- 3 Research on Clouds within EUROTRAC.- 4 Surface Exchange.- 5 Chemical Transfer and Transport Modelling.- 6 Instrumentation.- 7 Policy Applications of the EUROTRAC Results: The Application Project.- II An Overview of the Scientific Work of the Subprojects.- 8 Field Measurements.- 8.1 ALPTRAC: High Alpine Aerosol and Snow Chemistry Study.- 8.2 GCE: An Overview of Ground Based Cloud Experiments.- 8.3 TOR: An Overview of Tropospheric Ozone Research.- 8.4 TRACT: Transport of Air Pollutants over Complex Terrain.- 9 Biosphere-Atmosphere Exchange.- 9.1 ASE: An Overview of the Air-Sea Exchange Subproject.- 9.2 BIATEX: Assessment and Achievements.- 10 Laboratory Studies.- 10.1 HALIPP: Heterogeneous and Liquid Phase Processes.- 10.2 LACTOZ: Chemical Processes related to Tropospheric Ozone.- 10.3 CMWG: The Chemical Mechanism Working Group.- 11 Modelling and Emissions.- 11.1 EUMAC: European Modelling of Atmospheric Constituents.- 11.2 GENEMIS: Generation of European Emission Data for Episodes.- 11.3 GLOMAC: An Overview of Global Atmospheric Chemistry Modelling.- 12 Instrument Development.- 12.1 JETDLAG: Joint European Development of Tunable Diode Laser Absorption Spectroscopy for the Measurement of Atmospheric Trace Gases.- 12.2 TESLAS: Tropospheric Environmental Studies by Laser Sounding.- 12.3 TOPAS: Tropospheric Optical Absorption Spectroscopy.- Appendix A.- Table 1 EUROTRAC Subprojects and Subproject Coordinators 1987 to 1955.- Table 2 EUROTRAC International Executive Committee Members 1987 to 1996.- Table 3 Countries Participating in EUROTRAC.- Table 4 EUROTRAC Scientific Steering Committee Members 1986 to 1996.- Table 5 EUROTRAC International Scientific Secretariat 1986 to 1996.- Table 6 Chemical Mechanism Working Group Members.- Table 7 The Cloud Group Members.- Table 8 Application Project Members.- Appendix B.- EUROTRAC Publications.- Subject Index;.