The main purpose of the present study is to define places in the major Athens area where the heat island effect occurs. Several important climatic parameters are examined in combination with the application of various statistical tests. From this research it is mainly observed that the central and the west industrialized parts of the city of Athens develop intensely the urban heat island effect.

The effect of the synoptic scale atmospheric circulation on the urban heat island phenomenon over Athens, Greece, was investigated and quantified for a period of two years, using a neural network approach. A neural network model was appropriately designed and tested for the estimation of the heat island intensity at twenty-three stations during the examined period. The day-by-day synoptic scale atmospheric circulation in the lower atmosphere for the same period was classified into eight statistically distinct categories.

During the design process of heating systems, the designer must analyse various factors in order to determine the best design options. Therefore, the environmental aspects of a product should be included in the analysis and selection of design options if an environmentally - aware design is to be produced. If one wishes to assess a products environmental impact, its whole life cycle must be studied. The Life Cycle Assessment (or LCA) methodology is an example of one kind of environmental analysis which included the entire life-cycle of a product. However, this method has some limitations.

Acoustics research is thriving and allowed significant progress in the improvement of living conditions.However, a gap has been noted between research and practical applications in situ. This awareness has encouraged laboratories to investigate the urban sonic environment from different perspectives. Thus the following :1) The sound signal is not a single element, it is always the result of a propagation in a built space and the circumstances that bring about its reception : position and mobility of the listener.

The author presents an example of ventilation for high-standing collective dwellings with a system that combines thermal comfort and healthy ventilation. It consists in picking air on the roof and dispatching it into the building with a vertical tubing. The air is filtered then pulsed by a fan and dispatched in the dwellings via horizontal tubes.
That system solves the acoustic problem too in so far as air is taken on the roof with no air entry on the facade.

The particle contamination is well mastered whereas the molecular and microbiological contaminations are not : the existing purifying systems generally use the trapping but not the destruction of the contaminants. CIAT company has developed the NEO system to destroy those contaminants : it consists in combination of adsorption on activated carbon with photocatalyst, the results of that coupling are encouraging.

The authors present the different techniques for the reduction of radon concentrations in buildings, mainly in individual buildings. Natural ventilation is one of the solutions, a second one is the depressurization of the ground and the last one is pressurization of the building with the use of mechanical ventilation. Each building is a specific case but operational solutions exist that have to be forecasted .

The main results of 3 studies on the measurment of the indoor air pollution are presented in this paper. The first article deals with NO2 concentrations in houses, the second one on passive tobacco nuisance that is widely spread and at important degrees and the last one on particle concentrations after the falling of the World Trade Center Towers in New York city. This paper shows the complexity of indoor air pollution phenomena.

The aim of the authors is to study the differences of indoor air quality between 8 different office buildings along with the different individual exposition between the occupants of the same building. That study lasted 5 months. The results of the measurements have shown that except for ozone, the concentrations of all the measured pollutants are low and that there are more variations between people than between buildings.

The author relates first the history of the cabin air filters then he presents different test methods for the cabin air filters : among them a test method by olfactometry. Finally the Freudenberg offer is presented showing the results of efficiency measurement of activated carbons and fractional efficiency of particulate medium insisting on the efficency of the filtration for particles whose diameter is less than 2.5 micrometers.