Preface. Acknowledgements. Atmospheric Chemistry: General Aspects. European Research on Atmospheric Global Change: EU Supported Projects and Future Planning; G. Angeletti. Probing Chemical Mechanisms in Clean and Polluted Environments through Field Measurement/Model Comparions; N. Carslaw, et al. Formation and Cycling of Aerosols in the Global Troposphere; F. Raes. Active and Passive Sensing of Aerosol from Space; G.G. Matvienko, V.V. Belov. Global Self-Regulation of Ozone in the Earth Atmosphere; V.V. Lunin, A.B. Zosimov. Tropospheric Multiphase Chemistry in Field, Modelling and Laboratory Studies; H. Herrmann, et al. Stable Carbon Isotope Ratio Measurements: A New Tool to Understand Atmospheric Processing of Volatile Organic Compounds; J. Rudolph. Air Pollution Monitoring in Romania; R. Mocanu, E. Steinnes. Modelling. Modelling of Ozone and Secondary Organic Aerosol across Europe: Results from the EMEP Models; D. Simpson, Y. Andersson-Skold. Emissions. Emission of Atmospheric Pollutants from Aero Engines; P. Wiesen, et al. Arctic Regions. The Impact of Halogen Chemistry on the Oxidation Capacity of the Trophosphere; U. Platt. Kinetic and Mechanistic Studies in the Laboratory. Recent Developments in Peroxy Radical Chemistry; R. Lesclaux. Atmospheric Chemistry of Oxygenated VOCs; G. Le Bras, et al. Experimental and Theoretical Study of the Atmospheric Degradatin of Aldehydes; D. D'Anna, C.J. Nielsen. The Photochemical Degradation of Chloral and Oxalyl Chloride; L. Nolan, et al. Fluorinated Radical Reactions of Atmospheric Importance; W. Hack, et al. Heterogeneous Reactions Affecting Chlorine Activation in the Troposphere; M.Yu. Gershenzon, et al. Photochemical Processes in the Atmosphere; G.K. Moortgat. Atmosphere-Related Aspects of the Aqueous Phase Oxidation of Sulphur Dioxide; W. Pasiuk-Bronikowska. Soot Particles from Different Combustion Sources: Composition, Surface groups, Oxidation under Atmospheric Conditions; M.N. Laritchev, J.C. Petit. Poster Contributions. Kinetic and Mechanistic Studies. Investigation of Particle Formation in the Photo-oxidation of Dimethyl Sulphide; C. Arsene, et al. Model Study of the Photooxidation of CH3SO2SCH3 at Atmospheric Pressure: Thermal Decomposition of the CH3SO2 Radical; N.I. Butkovskaya, I. Barnes. Atmospheric Oxidatin of Selected Primary Alcohols; F. Cavalli, et al. Interaction of Ozone with Sodium Chloride -- a Possible Additional Source of Chlorine in the Atmosphere; A.V. Levanov, et al. Transition Metal Ions in The Processes Of Acid Rain Formation; A.N. Yermakov, A.P. Purmal. The Role of HCl and HBr in Heterogeneous Processes of Stratospheric Ozone Decomposition; S.V. Savilov, T.V. Yagodovskaya. Comparison of the NO3 Heterogeneous Uptake on Dry and Humidified NaX (X=Cl, Br) Salts; V.V. Zelenov, E.V. Aparina. Global and Regional Air Pollution Studies. Air Pollution in Turkey; T. Dogeroglu. Background State and Trends of Sulfur Dioxide and Sulfate Aerosols in the Atmosphere over Russia; V.I. Egorov, et al. Changes in Land Use and Land Cover in Arid Southern Mediterranean on the Long Term Using Remote Sensing and GIS -- A Case Study of Northwest Egypt; A. Gad. Investigation of PAH in Atmospheric Aerosols and Precipitation's of East Siberia; A. Gorshkov, I. Marinaite. Regional Atmospheric Changes Caused by Natural and Antropogeneous Factors; K. Karimo, R. Gainutdinova. Environmental Problems connected with Air Polution in the Industrial Regions of Ukraine; M. Kharytonov, et al. Comparison of Experimental and Calculated Data on Ion Composition of Precipitation in the South of East Siberia; E.V. Kuchmenko, et al. Monitoring of the Spatial and Temporal Variation of the Particle Size Distribution and Chemical Composition of the Atmospheric Aerosol in Siberia; K. Koutsenogii, et al. Model Accumulation Mode of Atmospheric Aerosol Including Photochemical Aerosol Formation, Coagulation, Dynamics of the Atmospheric Boundary Layer and Relative Humidity; P. Koutsenogii. Volatile Organic Compounds (VOCs) in the Atmospheric Air of Moscow: The impact of Industry and Transport; O.O. Laritcheva, et al. Transcontinental Observations of the Surface Ozone and Nitrogen Oxide Concentrations by using the Carriage-Laboratory; T.A. Markova, N.F. Elansky. Evaluation of On-Road Vehicle Emissions: The Lundby Tunnel Study in Gothenburg, Sweden; M. Petrea, et al. Season Variation of Near Ground Impurities of O3 and CO in East Siberia; V. Potemkin, V. Obolkin. Roadside Measurements of Traffic Emissions from Motorway BAB 656 in Heidelberg with Emphasis on Particles; E. Rosenbohm, et al. The Effect of Distant Sources of Ozone and PM10s on Boundary Layer Air Quality in Cornwall -- a rural area in the UK; L. Salter, B. Parsons. Chemical Composition of Atmospheric Fall-Out as an Indicator of the Impact of Local Aerosol Emission Sources on Global Air Quality Change; Y.I. Kovalevskaya, et al. Influence of the Antropogenic Emissions and Atmospheric Chemical Processes on Climate in XXI Century; I.K. Larin, A.A. Ugarov. Methods and Techniques. Digital Photogrammetric Method for Ecological Monitoring; L. Trubina, et al. Hydrogen Technology: H2 Storage and Release; O.S. Morozova. Impact on Ecosystems. Effects from Industrial Emissions on the Lake Baikal Region Forests; T. Mikhailova, N. Berezhnaya. Assessment of Siberian Forest Ecosystem Stability Against the Acidification; M. Semenov. Air Pollution in the Adirondack Park; Public-Private Efforts to Reduce Acidity in Soils and Water; B. Jancar-Webster. Subject Index.