By Øystein Hov (auth.), C. De Wispelaere (eds.)

In 1969 the North Atlantic Treaty association demonstrated the Committee at the demanding situations of contemporary Society. pollution was once from the beginning one of many precedence difficulties less than learn in the framework of the pilot reviews undertaken through this Committee. The association of a each year symposium facing pollution modeling and its program is likely one of the major actions in the pilot research with regards to pollution. After being prepared for 5 years by way of the us and for 5 years by means of the Federal Republic of Germany, Belgium, represented through the best Minister's place of work for technological know-how coverage, grew to become liable in 1980 for the association of this symposium. This quantity comprises the papers offered on the 14th Inter­ nationwide Technical assembly on pollution Modeling and its Appli­ cation held in Copenhagen, Denmark, from twenty seventh to thirtieth September 1983. This assembly was once together equipped by way of the top Minister's workplace for technology coverage, Belgium, and the nationwide business enterprise of Environmental safeguard, pollution Laboratory, Ris~ nationwide Laboratory, Denmark. The convention used to be attended by way of 103 partici­ pants and forty three papers were offered. The individuals of the se­ lection committee of the 14th I.T.M. have been A. Berger (Chairman, Belgium), W. Klug (Federal Republic of Germany), ok. Demerjian (United States of America), L. Santomauro (Italy), R. Van Dop (The Netherlands), R.E. Turner (Canada), C. De Wispelaere (Coordinator, Belgium).

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This suggests that linear models might be inadequate for the examination of emission control scenarios. However, we show that by assuming "efficient" removal of S02 we can construct a model which avoids explicit incorporation of the wet removal process. The validity of this model is demonstrated by comparing model predictions with observations of annually averaged wet deposition at 62 stations in Eastern North America (ENA). INTRODUCTION The most common type of long-term model (Fisher, 1978; Venkatram et aI, 1982) for the transport and deposition of sulfur represents transformation and removal processes with parameters that do not depend on the concentration of sulfur.

The ozone isopleths diagram for London using the AERE Harwell model was constructed by varying the urban emissions, and then taking the 0900 h concentrations of NMHC and NOx as representative of the maximum urban burden. The maximum downwind concentrations of ozone were taken to construct the isopleths diagram. It can be seen that the choice of hydrocarbon mechanism had a significant impact on the model result. The AERE Harwell model predicted that HC control always reduces 03, while NO x control in some cases may even increase 03.

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