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Green City Solutions works closely with Climate KIC, Europe's largest public-private network for innovations against climate change. The cooperation includes, e.g., support for environmental performance testing of the CityTree in urban environments as part of the “Scaler Project”, a financial support programme released by the European Commission. As part of a three-stage measurement campaign in Modena, Italy, the impressive measurement results of the last stage are now available: The CityTree filters 38% of the particularly dangerous ultrafine particulate matter from the air, 20% of PM 2.5 and 18% of black carbon.