The rapid deterioration of the environment in many countries around the world, or of segments and aspects of the environment in specific locations, made it necessary that immediate - even if only short term - solutions be found to as many of these problems as possible. Nevertheless, in the long run, long range and long term solutions must be found taking into account the effects of one country or region on another as well as of the inter-action between the different types of pollution over extended periods of time. It was the purpose of the Tel Aviv meeting on Pollution: Engineering and Scientific Solutions, to address