90% of urban population is breathing polluted air, which leads to around 8 millions deaths annually and 1,6$ trillion in annual economic damage in the EU. Green City Solutions is a biotech and IoT startup leading the way in the business of air pollution reduction. The company has developed a freestanding solution, called "CityTree", which features a moss culture that naturally absorbs the pollution that occurs in urban environments. Each unit has the effect of up to 275 traditionally planted urban trees, yet it requires less than 1 % of the space and no groundwork. The CityTrees have a reach of up to 50m and thanks to IoT technology, solar power and water reservoirs, they only need a few hours of maintenance each year.