German start-up CityTrees has created massive vertical planter boxes filled with air-filtering plants to improve air quality in urban areas. The planters are called CityTrees and offer the environmental benefits of 6.5 million conventional trees, but at 5% of the associated cost and with 5% less space required. Each CityTree is also equipped with a digital screen to allow the space to be used for advertising. creates huge vertical planter boxes for public spaces utilizing plants adept at removing dust, nitrogen dioxide and ozone gasses from low-lying smog. Hong Kong , Dresden , Hong Kong and Dresden are among the handful of cities currently using CityTrees .
German start-up CityTrees has created massive vertical planter boxes filled with air-filtering plants to improve air quality in urban areas. The planters are called CityTrees and offer the environmental benefits of 6.5 million conventional trees, but at 5% of the associated cost and with 5% less space required. Each CityTree is also equipped with a digital screen to allow the space to be used for advertising. Hong Kong , Dresden , Hong Kong and Dresden are among the handful of cities currently using CityTrees .