Different parameters of pollution are measured in ground water, surface water and wastewater efluents in Slovenia in order to asses present state of pollution. Results are used as basis for decisions for future autonomous development and managment of environment in Slovenia. Measurments are made by different laboratories. Results of our research will contribute to comparability of results of Slovenian laboratories. Results from the studies of wastewater treatment in laboratory scale reactors, can be used for the construction of industrial scale wastewater treatment plants (based on new technologies: SBR, biofilm) including efficient excess sludge treatment facilities. The effective characterisation and control of effluents discharges using an integrated approach will contribute to improvement of the receiving water quality. Research in the field of atmospheric chemistry contributes to the explanation of chemical transformations in the polluted boundary and their influence on the formation of oxidants and acidifying compounds. As pollution is not inhibited by borders, urgent ecological problems are typical for all countries. Ecological problems attracting the greatest attention in Europe are therefore also important for Slovenia. For development of strategies for reducing the anthropogenic contribution of secondary pollutants, in particular photo-oxidants and acidifying compounds, modelling has become an indispensable tool of policy makers. Therefore, laboratory studies (kinetic parameters, mechanistic data) are required for models, which can be used for predicting the chemical processes in the atmosphere. Through our co-operation in the EUROTRAC-2 project we have contributed some necessary kinetic data for models. Investigations of aerosol reactivity are particularly important because they are practically the first of this kind in Slovenia. Heterogeneous reactions change the composition as well as the character of aerosols (e.g. formation of acidic particles) that can have a negative influence on human health and can cause damage to all environments.