## 4 Results and Discussion  
The results for eight individual blocks are presented for the city of Novi Sad. The same wind conditions were applied to all of the examples shown in this section. Wind directions and intensities used in this study are from reliable sources [34]. Urban blocks were carefully chosen to represent different urban morphologies that are typical for the area of Novi Sad. All urban blocks have a total area of around 10,000 m\({}^{2}\) to represent similar location potential. Some of them were slightly modified to represent similar external conditions for all the examples. Graphical results for corresponding blocks are also presented. Ideal graph results for the urban block would have only values of 100 in respect of the stagnant air area of the building envelope throughout the year. More values to the right side of the graph represent problems in geometry. The first morphology represents an urban block comprising one-family residential buildings. In Figure 5, the results of the method presented in this paper have been applied. Vertical areas with stagnant air are shown graphically. East- and west-oriented faces of the structures have results that are worse than north and south faces. This problem is most visible in the structures in the 3D model that are in close proximity to each other. A graphical representation of the analysis (Figure 6) shows that this type of block is moderately ventilated. The curve is set to a \(y\)-axis value of 0 near 85% of the \(x\)-axis. This should be interpreted that the most critical areas of this block have 15% air stagnation situations throughout most of the year. Figure 5: Axonometric result of the method described in this paper on one-family residential building block type. N points to the north relative to the 3D model. The second morphology analyzed in this paper is the traditional urban block. This type of block is typically located in old city centers. Most of the areas inside the block are not properly ventilated (Figure 7). The close proximity of buildings in the inner courtyard is the main reason for this. This can result in the deterioration of health conditions in the housing area. The graphical analysis (Figure 8) shows lower levels of ventilation than for previously analyzed urban blocks. From all vertical surfaces, 19% of their calculated area has less than 85% air quality distribution throughout the year. The gradual shape of the curve suggests a high percentage of the vertical surfaces are not suitable for windows in regard to natural ventilation. The 0 value on the \(x\)-axis is reached at 45%, and if those surfaces host windows, stagnant air is present for most of the year. Figure 8: Graphical result of the quality of air in the context of air velocities higher than 0.15 m/s near surfaces of traditional urban block type. Figure 6: Graphical result of the quality of air in the context of air velocities higher than 0.15 m/s near surfaces of one-family residential building urban block type. Figure 7: Axonometric result of the method described in this paper on traditional urban block type. N points to the north relative to the 3D model. The third urban morphology that was analyzed is an urban block with multiple towers, typically built in the second half of the 20 th century in Europe. From the results of the analysis in Figure 9, only small parts of the surfaces have problems with ventilation. A low build density has an influence on wind intensity in the whole area. There are surfaces with lower ventilation, but they are created because of the turbulence effect. A graphical representation of the results (Figure 10) shows that the air quality distribution throughout the year is very good. Only 13% of all vertical surfaces have values of air quality distribution that are below 95% throughout the year. The highest value on the \(y\)-axis suggests that the ideal area for window placement is much higher than that in previous urban blocks. The fourth urban morphology is a slab city block type.