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One of the most important problems in air traffic is the production of air pollutants at and near airports. The estimation can be made today with help of calculation methods and measuring techniques. In most cases, calculations lead to a usable approach, but considering the intensive development of air traffic, measurement technologies are growing in importance.To reduce the high concentration of pollutants in the atmosphere, airports have to consider four sources:fleet operation in-house energy supply ground feeder traffic of motor vehicles catering and supply services for airports. This system measures emissions during flight events (take off, landing and runway operations) from airplanes and from other airport specific sources. This very precise method makes it possible to compare this data with the calculated emissions (LAS-PORT) of air pollutants in the big area of airports. This combined method is much more accurate, than the single mathematical modelling of emissions and their distribution. This method leads to a much improved accuracy of planning of airports and air traffic near and at airports compared with the current situation. KeywordsAge of airplane · air pollution · air traffic · airplane engine · emission analyser · apron area · auxiliary power unit · calculation of the exhaust gas emissions · take off · landing · runway operation Michael Palocz-Andresen NyME, 9400 Sopron Bajcsy Zs. u. 4, Hungary

⎯ Climate change exerts one of the most relevant impacts on hydrological processes by altering precipitation patterns and evapotranspiration processes. Forests, the terrestrial ecosystems with the highest water demand, will likely be the most influenced by the changing water regime. The study aims to outline the vital role forests play in the global water cycle, a role that increases as climate change intensifies. The deforestation that has occurred in recent years is a main trigger of global climate change, one that negatively affects climate-sensitive areas. The study focuses on the importance of crown and litter interception as well as the manner in which climate change alters these. We also present some results for forest and groundwater relations in Hungary and the impact of forests on runoff during extreme weather conditions.

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