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The trees in the cities improve our environment by increasing the humidity, absorbing dust, absorbing noise and reducing radiation through their shading effect [7]. These effects are explicated through the branch system, crown shape, and foliage of the trees. The value of open spaces in large cities can be measured by the mitigation of an urban heat island effect (UHI) and a visual / aesthetic effect. So it is difficult to estimate value, as a monetary amount has to be allocated to living resources (plants) that we do not actually use [12]. The environmental benefits of trees are obvious, as they have a positive effect on the microclimate of a given area, be it a park, a public area covered with trees or a road lined with trees. But if we want to express in actual terms how much are these trees worth, what values do we get? There are several methods available to perform this valuation (forestry, industrial, fuel value) [2], but perhaps the “ideological” (expressed in money) value of living trees best illustrates the importance of green resource in our public spaces. Methodologies for determining wood as an environmental value have also been developed in several countries (Australia, USA, UK, Germany), and with the help of these literature data, the Hungarian researchers prepared the valuation procedures we also used [11]. The calculated value is uniformly based on the size and health status of the active foliage [2]. In our study with the help of these methods we would like to quantify how much are the trees under which we go in the center of Kecskemét every day worth. We surveyed the woody plants in Szabadság and Kossuth Square. Kecskemét has retained its market town character, but the proportion of its green areas has decreased significantly in the recent period. Between 2009 and 2017, the decrease was more than 30%. The size of the green area that can be used as a public space per capita is low, 24.3 m / person [3]. With this, the Bács-Kiskun county seat was behind Brussels, Munich and Milan in terms of this parameter of green spaces [1]. That is why we saw its importance in assessing and verifying with data the value of the nearly 250 trees in the studied area in the green surface system of our main square.

The outstanding values of our city : The trees