Moss-covered banks are supposed to filter pollutants from the Cologne air

As the Kölner Stadtanzeiger reports, Cologne wants to use so-called City Trees to combat pollution in the west of the city. However, these City Tress are not conventional trees: they are benches with a 4-metre high, moss-covered rear wall.

As the manufacturer of the City Trees emphasizes, the benches act as air filters. Moss binds particulate matter, nitrogen oxides and CO2 equivalents, produces oxygen and cools the air. According to the manufacturer, the City Trees are completely self-sufficient thanks to a fully automatic irrigation system and an energy supply using solar cells.

Initially, three benches are to be placed in the west of the city. In a district which, according to information from the Kölner Stadtanzeiger, is particularly polluted. As the Kölner Stadtanzeiger states, one of the benches costs 25,000 euros.

The City-Trees are manufactured by a Berlin start-up, the green tech company Green City Solutions. It was founded by four friends, experts in the fields of architecture, mechanical engineering, media informatics, business administration and horticulture. According to the Kölner Stadtanzeiger, City Trees have already been placed in Oslo, Dresden, Berlin and Hong Kong.

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