# Implementation of the 3-30-300 Green City Concept: Warsaw Case Study
## 3 Results
### 30% Green Coverage of the Area  
The graph presented in Figure 6 shows the percentage of districts occupied by green areas. In addition, the coverage threshold required by the concept guidelines, which is the assumed 30%, is highlighted. Due to the lack of clear guidance on what should be considered as green areas, two variants of this condition were analyzed.  
Figure 5: Visibility of 3 trees for the entire Warsaw (red (0%)—percentage of buildings where 3 trees cannot be seen from any flats, yellow (partly)—percentage of buildings where 3 trees can be seen from only some flats (partly), green (100%)—percentage of buildings where 3 trees can be seen from all flats).  
The first variant, marked in yellow in Figure 6, represents green areas, including only forests and parks. In this case, the districts of Wesola, Rembertow, Wawer, and Bielany have the highest percentage of greenery and exceed the adopted threshold of 30%. The second variant, marked in green in Figure 6, includes areas covered with all forms of greenery, including lawns, etc. The results show that, in this case, the percentage of green areas in each district increases greatly; in some of them, it increases even by half of the original value. Comparing the two variants, it is clear that with tree-covered areas, only 4 districts meet the 30% condition, while in two variants there are as many as 12 such districts.  
These results show how important it is to clarify what is meant by green areas, as this definition is crucial for meeting the criterion adopted in the 3-30-300 concept. The differences in the spatial distribution of the results can be seen perfectly in Figures 7 and 8, where the results are presented on maps using the cartogram method.  
Figure 7 shows the results of covering Warsaw's districts with forests and parks only. The red color in the cartogram represents districts that do not meet the condition of 30% coverage, meaning that there is not enough greenery in their area. The green color represents districts that meet the condition. The map shows that mainly peripheral districts, located in the eastern part of the city, have 30% or more of their area covered by parks or forests. These areas have suburban forests, which influences the result of the study. Bielany, located in the north-western part of Warsaw, also has a forest, the Bielany Forest, in its territory, which influences the result. The remaining districts, including not only the central ones, do not reach the target threshold, indicating an insufficient amount of wooded green areas in most areas of the city.  
Figure 6: The 30% area covered by greenery for districts of Warsaw (yellow—percentage of district area covered by only parks and forests, green—percentage of district area covered by all forms of greenery, red—a line indicating the required value of 30% of the area covered with greenery).  
Figure 8: Second variant for condition 2: 30% coverage by all forms of greenery (red—districts with less than 30% of the area covered by all forms of greenery, green—districts with more than 30% of the area covered by all forms of greenery).  
Figure 7: First variant for condition 2: 30% coverage by parks and forests of districts (red—districts with less than 30% of the area covered by parks and forests, green—districts with more than 30% of the area covered by parks and forests).  
Figure 8 shows the result of the analysis regarding the coverage of Warsaw's districts with all forms of greenery. In this case, only the districts that are located in the central part of the city do not meet the set condition. The remaining districts meet the criterion of 30% greenery coverage. The exception is the Ursus district, which, despite including all forms of greenery, does not reach the 30% level. The reason is similar to the analysis of the visibility of three trees. This was historically an industrial district, with a significant share of factory areas. Nowadays, these areas are being developed with dense housing, which, unfortunately, is not accompanied by the development of green areas.