Since November 2020, pupils at Hampstead Hill Pre-Preparatory and Nursery School in London have been able to breathe cleaner and fresher air at break time. The independent school has installed two CityTree air filters in the schoolyard, which use real, living moss to clean the air of fine dust particles and enrich it with humidity. Due to the inner-city location and the outdoor area with limited air circulation, measurements showed comparatively high levels of fine dust. Together, the two CityTrees can clean up to 10,000 cubicmetres of air per hour – that corresponds to the hourly breathing volume of 20,000 people.
However, the moss filters here not only serve to purify and cool the air in hot summer months. They are also a good opportunity for the teachers to teach the children about biology, the environment and climate change in a practical and tangible way. In addition, the pupils created numerous pieces of creative art around the theme “Superhero Moss Eats Fine Dust” as part of a painting competition.
2x CityTrees in the schoolyard of Hampstead Hill School (London)
Since September 2021
PROBLEM & SOLUTION:
Adjacent road causes high concentration of particulate matter. The moss filters create a fresh air zone in the schoolyard and are illustrative examples of the use of natural solutions to human-made problems.
“The CityTree is really cool because it cleans the air so we can breathe and playin the clean air. It has a door and inside there are lots of pipes. They help the moss to water itself! Our city tree is so special because our plants and animals are very important to us and pollution could kill all these species. We don’t want that because they are so important to our planet”.
Schoolgirl (7 years)