Mosses have compared to other plants a large bio-active surface, they transpire more and also actively reduce some pollutants. There is a range of test sites with open air experiments in order to test the effectiveness for fine dust and reduction and air quality improvement. To exemplify the potential a product that makes use of the moss capacities is described for this NBS – type: The City Tree. A City Tree is a bio-tech-filter with the aim to improve the air quality in cities. The City Tree is a compact and mobile construction, vertically planted with different species of mosses on its front and back side. The moss surface contribute to improve the air quality through the binding of air pollutants like particulate matter and nitrogen oxide. Due to its large surface (in comparison to many other plants), mosses store a relatively huge amount of water and at the same time provide a relatively large surface area for water transpiration. As a consequence the transpiration of water leads to a reduction of air temperature on a local scale.
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