The aim the thesis is to point out the difference of relative air humidity in urbanized environment and to recommend the possibilities of adjusting urban vegetation so as to achieve the most favorable values. In the first part we focused on the explanation of the problem and in the second one on the determination of the relative humidity of the air at the stations with different conditions and active surface. Measurements have confirmed that the relative humidity varies at different sites and the habitat conditions affect the resulting values, either positive or negative. During the ongoing measurements, changes occurred in the weather, resulting in a more objective picture of the relative humidity. The work can be used as a basis for further research, but also as a reason to use vegetation in new buildings in the city.