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Challenge / Goal

The Walter-Benjamin-Square is located in the centre of Berlin and just meters away from the busy Kurfürstendamm Avenue. Office First, administrators from the square, decided on implementing a solution that could increase the number of visits whilst improving the ambient conditions. There were three aspects specifically reducing the usability and comfort levels of the square:

  1. Proximity to the Kurfürstendamm Avenue increases the concentration of air pollutants from the high traffic flow;
  2. A high share of the square's perimeter is surrounded by tall buildings, which reduce the airflow through the square;
  3. The square has a high impervious area, reducing the capacity for planting vegetation or trees which can provide shade or fresh air.


Green City Solutions installed six CityTrees to solve the occupational challenges on the Walter-Benjamin-Square. Two triangular set-ups of three CityTrees were created to form "Clean Air Zones". These CleanAirZones aimed to positively impact the local microclimate (improving air quality, the greenery, and seating conditions) and thus attract more people to the city plaza. For scientific purposes, an extensive measurement was made in cooperation with our scientific partners TROPOS and ILK.

Citizen participation

Green City Solutions launched a residents' survey and asked nearby restaurant owners for their opinion on the CityTrees and the installation on the square. Furthermore, they organised an opening event to inform the residents and interested parties about the product and the project targets.


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Time period

Planning time: 6 months to 1 year

Implementation time: Less than 6 months

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