For better air quality
in cities

Covid-19 News

The perfect combination of plants and
Internet of Things technology

The ability of certain moss cultures to filter pollutants such as particulate matter and nitrogen oxides from the air makes them ideal natural air purifiers. But in cities, where air purification is a great challenge, mosses are barely able to survive due to their need for water and shade. This problem can be solved by connecting different mosses with fully automated water and nutrient provision based on unique Internet of Things technology. Air filtering performance is quantitatively proven and the plants’ requirements are measured in real time. That’s how the CityTree came into being – the world’s first bio-tech filter to quantifiably improve air quality.

The world’s first bio-tech filter to quantifiably improve air quality

Mosses for cleaner air

Different types of moss bind environmental toxins such as particulate matter and nitrogen oxides while producing oxygen at the same time.


Optimum watering

Water provision is either connected or independent, thanks to a fully automated irrigation system.

Cutting edge IoT technology

Integrated IoT technology delivers comprehensive information on performance and status as well as environmental data on the CityTree’s surroundings.


Energy provision

Energy is provided via grid connection.

Variable ventilation

Controllable ventilation technology allows airflow to be intensified, meaning that the filter effect can be increased as required.

Pleasant cooling effect

Mosses store large quantities of moisture, and the considerably increased evaporation surface creates an immense cooling effect.

Proof of performance from independent experts

Since its invention in 2014, the CityTree is continuously being further developed. This includes all parts of this worldwide unique product idea: from design to energy and water supply to environmental performance. Thereby, we don’t just build on our comprehensive background experience but also on the expertise from different research-, technology-, sponsor- and certification partners. A particular development focus is on the steady improvement of the City Tree’s environmental performance that is being verified and reviewed by independent experts in complex laboratory and field studies.

Scientific Partners

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The renomated Leibniz Institute for Tropospheric Research is our lead partner for measurement and analysis of the impact of our products. The head of the department of Experimental Aerosol and Cloud Microphysics Professor Dr. Alfred Wiedensohler himself superrvises the work and partnership.

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The ILK Dresden is our scientific partner in the field of industry-related research, development and technology transfer in the wide range of air handling and refrigeration technologies and their applications including related scientific and technical fields. Together with the ILK we measure the filtration and cooling power of moss.

Grow together! Watch and visit us…

Current Posts

30. October 2020


A new series of tests with external measuring institutes shows the enormous filter effect of young mosses
The CityTree has a significant effect on air quality. It removes more than…

23. October 2020


Green City Solutions turns six today, so: Happy Birthday!

Since their incorporation and invention in 2014, Green City Solutions and the CityTree…

12. June 2020


Another CityTree has left our moss farm and now provides clean and fresh air in front of the Telekom headquarter in…


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    Green City Solutions GmbH
    Fernstrasse 27,
    15741 Bestensee



    Telephone: +49 (0) 33763 222 144

    Air pollution in cities


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    The CityTree – the world‘s first bio-tech filter to quantifiably improve air quality

    Model from 2020
    Model from 2020