Role of Atmospheric Models in Air Pollution Policy and Abatement Strategies: Multipollutant Modeling and Policy: Dressing the Emperor and Avoiding False Paradigms; R.L. Dennis. Meteorological Aspects of Ozone Episodes in Southern Ontario: A Mesoscale Model Investigation; R.S. Tangirala. Integrated Regional Modeling: Meteorological Modeling in Sydney, Australia: Case Study of Smog Event; P.J. Hurley, et al. Lake Breezes and Their Impact on Groundlevel Ozone Transport over Southwestern Ontario and Southeastern Michigan; D.M.L. Sills, P.A. Taylor. Global and Longrange Transport: Sulfur Deposition in Asia: An Assessment of the Present Situation and Future Scenarios; G.R. Carmichael, R.L. Arndt. The European Long Range Tracer Experiment (ETEX): Preliminary Evaluation of Model Intercomparison Exercise; G. Archer, et al. New Developments: Mesoscale Modeling of Clouds and Aerosol Particles; A.I. Flossmann. Accidental Releases: Validation of a Combination of Two Models for Longrange Tracer Simulations; J. Brandt, et al. Model Assessment and Verification: Air Pollution in Coastal Cities; D.G. Steyn. Poster Session: Use of the UB/NMC Model for the Simulation of the Lifecycle of Chernobyl Radioactive Cloud; M. Dacic, B. Telenta. 74 additional articles. Index.

Proceedings of the Millennium NATO/CCMS International Technical Meeting on Air Pollution Modeling and its Application, held May 15-19 in Boulder, Colorado. This volume is the latest in a series of proceedings dating back to 1971. The book addresses the problem of air pollution and reports the latest findings and developments in air pollution modeling, from a truly international list of contributors.

In 1969 the North Atlantic Treaty Organization (NATO) established the Committee on Chal- lenges of Modern Society (CCMS). The subject of air pollution was from t,lw start one of the priority problems under study within the framework of various pilot. studi('s undertaken by this committee. The organization of a periodic conference dealing with air pollution modelling and its application has become one of the main activities within the pilot ~tudy relatillg to air pollution. The first five international conferences were organized by the United Statcs as the pilot country; the second five by the Federal Republic of Germany: thc third five by sselgium; the next four by The Netherlands; ami the two most recent by Delllllark. This volume contains the papers presented at the 21st NATOjCCMS International Technical Meeting (ITM) on Air Pollution Modelling and Its Application, held in ssaltimorc. Maryland, during November 6-10, 1995. This ITM was jointly organized by the Riso National Laboratory of Denmark (Pilot Country); by the EPA National Exposurp Research Labora- tory, United States (Host Country); and by thc American MNeorologiea.! Soci('t.: *. Cnited States (Host Organization). The ITM was attended by 137 participants representing 29 countri('~ from North and South America, Europe, Asia and Australia. The members of t.hc NATO/CCMS Scientific Committee for the 21st ITM were R.M. van Aalst (The Nethcrlallds), D. Allfossi (Haly), C. Borrego (Portugal), N. Chaumerliac (Francc), H. van Dop (Thc :\Tethcrla.nds). S.-E. Gryning.