In 1949, when the North Atlantic Treaty was ratified, one of its articles explicitly noted '1hat member countries should contribute towards the further development of peaceful and friendly international relations." Specific problems related to the human environment were addressed by the Committee of Challenges of Modern Society (CCMS) of NATO, established in 1969. This provided a framework within which a series of International Technical Meetings (ITMs) on Air Pollution Modelling has been held. This volume documents the proceedings of the 18th meeting in this series. Science, like the arts and sports, provides an ideal vehicle for "developing peaceful and friendly international relations". National boundaries have never been barriers to the movement of air pollution, and fortunately this has also proved true of scientists studying the transport of air pollution. It is thus satisfying to record that since the mid-seventies it has been commonplace to find Eastern European scientists among attendees at the ITMs which have (in a very modest way) participated in a precursor to the process which has led to historical changes in Europe and which will undoubtedly lead to a tremendous increase in personal and intellectual exchange on a worldwide basis.

Inhalt

Opening Address.- Problems of Industrial Air Pollution Modelling Considering Soviet Experience.- Model Assessment And Policy Implications.- Developments in Modelling Air Pollution for Regulatory Uses.- Modeled Sulfur Deposition Trends since 1900 in North America.- The Impact of Emission Reductions on Mesoscale Acid Deposition in the Lower Ohio RiverValley.- Detection of Sulphur Emission Reductions in Europe during the Period 1979-1986.- A Quantitative Model Analysis of Year to Year Changes in Concentration and Deposition.- An Air Quality Forecast System for Photochemical Smog Episodes.- Analysis of Ozone Air Quality over the New York Metropolitan Area.- Regional Acid Deposition And Oxidant Modelling.- Delineation of the Influence of Major Emissions Regions on the Annual Acidic Deposition at Sensitive Areas.- Characterization of the Nonlinear Change in Annual Sulfur Deposition for a Change in Emissions.- Modelling Photochemical Pollution by an Eulerian Long-Range Transport Model.- Theoretical Prediction of Local Ozone Maxima Associated with the Passage of Cold Fronts.- Development of an Urban Grid Model for the Santiago, Chile Region.- The German Air Pollution Observation Network as a Base for the Validation of EURAD.- Routine Model for the Long-Range Transport Calculations of Sulphur and Nitrogen Compounds from Continuous Sources Allowing for Non-Linear Effects.- The Effect of Size-Dependent Dry Deposition Velocities in an Eulerian Regional-Scale Paniculate Model.- Simulation of a Wet Deposition Case in Europe Using the European Acid Deposition Model (EURAD).- Numerical Modelling of the Atmospheric Transport, Chemical Transformations and Deposition of Mercury.- Effects of Spatial Resolution on Tracer Field Simulations with an Eulerian Long-Range Transport Model (EURAD).- Estimation of the Annual Contribution of US Sulfur Emissions to Canadian Acidic Deposition and Vice Versa.- The Role of Grid-Based, Reactive Air Quality Modeling in Policy Analysis: Perspectives and Implications, as Drawn from a Case Study.- The Scientific Credibility of Regional Atmospheric Deposition Models Used for Control Strategy Development.- Regional Scale Modelling.- Regional and Mesoscale Meteorological Modeling as Applied to Air Quality Studies.- Nocturnal Flow on a Western Colorado Slope.- Regional Flow Fields in Northrhine Westfalia - A Case Study Comparing Flow Models of Different Complexity.- Spatial Variations of Aerodynamic Resistance over a Hill.- Simulation of Dispersion in Moderately Complex Terrain.- Diagnostic Derivation of Boundary Layer Parameters from the Outputs of Atmospheric Models.- Long Range Transport of Heavy Metals from Poland Computed by an Eulerian Model.- Time Evolution of Breeze Circulation in Alpine Valleys.- Mesoscale Flow-Fields and Dispersion in the Coastal Terrain of Eastern Korinthian Gulf in Greece during Summer.- Meso-Meteorological Studies in the Iberian Peninsula and Western Mediterranean Area.- Flow and Particles Trajectories over Terrain Thermal Inhomogeneities.- Modeling Heavy Metals in Europe's Atmosphere: A Combined Trajectory-Climatologic Approach.- Application of the Receptor Oriented Approach in Mesoscale Dispersion Modeling.- Eulerian Modeling of Atmospheric Dispersion over Portugal: Background Concentrations and Emission Data Preparation.- Dry Aerosol Deposition Over the North Sea Estimated from Aircraft Measurements.- Temporal and Spatial Resolution Requirements for Regional-Scale Dispersion Models.- A Preliminary Evaluation of ADPIC Model Performance on Selected ANATEX Releases Using Observed, Analyzed, and Dynamically Predicted Winds.- The Influence of Biogenic Emissions Estimates on Ozone Precursor Control Requirements for Atlanta.- Specification of Source Characteristics for Ozone Prediction in a Complex Airshed.- Global Scale Dispersion Studies Including Sub-Grid Scale Parameterization Of Transport And Exchange Processes.- Parameterization of Cloud Transport of Trace Species in Global 3-D Models.- The Global Numerical Simulation of the Distribution of CO in the Troposphere.- Tracer Transport in the Hamburg Climate Model.- Long Range Transport of Trace Gases and Aerosols in the Northeast Pacific Rim.- Vertical Transport and Scavenging of Pollutants by Convective Clouds.- Numerical Study of the Formation of Acidic Species in the Convective-Cloud Streets over the Japan Sea in Winter.- Cloud Chemistry Calculations Using a Chemical Grid.- A Simple Chemical Cloud Model: Can Simplicity Approximate Reality?.- Mesoscale Characterization of Cloud Microphysical and Chemical Processes: A Comparison of 3 Formulations.- Mesoscale Modeling of Pollutant Transport and Deposition in Case of Frontal Rain.- Accidental Releases Including Radioactivity And Dense Gas Dispersion.- Environmental Prediction Systems: Design, Implementation Aspects and Operational Experience with Application to Accidental Releases.- The WMO/IAEA/CEC Model Intercomparison Study (ATMES).- Poster Session.- Modelling of the Long-Range Transport of Radioactive Substances from Accidental Release.- Media: An Eulerian Model Of Atmospheric Dispersion. Validation On The Chernobyl Release.- Modelling of the Chernobyl Radioactive Cloud Dispersion.- Emergency Response Model Evaluation Using Diablo Canyon Nuclear Power Plant Tracer Experiments.- Flushing of Dense Gas from Bottomlands by Wind.- Atmospheric Dispersion of Ammonia Released in a Major Chemical Accident in lonava, Lithuania.- Evaluation of a Simple Dense Gas Model for Instantaneous Releases.- Modelling the Dynamics of Aerosols in Two-Phase Releases of Hazardous Materials.- Numerical Modelling of Cloud Dispersion in Forestry Pesticide Spraying Operations.- A Practical On-line Method for Estimating Pasquill Stability Class Using the Analysis of Wind Fluctuations.- Wind Field and Dispersion at Regional Scale: the HERMES Code.- Particle Diffusion Model Evaluation Against Tracer Experiment.- Management of Atmospheric Pollutant Venting - Applications and Development of Operational Management of Air Resources (OMAR).- A Decision Sequence for Selecting Public Domain Models for Accidental Releases.- Objective Meteorological Analysis for Use on Personal Computers to Provide Air Quality Model Inputs.- An Investigation into Two-Phase Jets.- Dispersion Modeling within Risk Assessment Studies.- The SEVEX Project, an Integrated Dispersion and Contamination Calculation for Complex Terrain and Accidental Releases.- An Operational Eulerian Dispersion Model Applied to Different Scales.- A Lagrangian Particle Dispersion Model for Long-Range Simulation of Accidental Releases of Radioactivity at the German Weather Service.- Meteorological Monitoring near the Pickering Nuclear G…