German SME commercialising MossTree — moss-based modular air purification units for urban pollution hotspots.
Green City Solutions GmbH is a German technology SME that develops and commercializes moss-based urban air purification infrastructure under the brand "MossTree." Their core product is a modular living structure that uses moss cultures to filter particulate matter and nitrogen oxides from city air at pollution hotspots — street-level installations near traffic intersections, bus stops, and public squares. They combine biotechnology (moss physiology) with smart city hardware to deliver measurable, locally-deployable air quality improvements without large urban greening projects. Their work sits at the intersection of environmental technology, urban planning, and IoT-enabled monitoring.
Both MossTree projects (2017 and 2019–2020) are built around moss cultures as the active air-cleaning medium, with the earlier phase establishing the concept and the later phase scaling it to market.
MossTree Phase 2 (EUR 1,270,850) explicitly targets 'urban hotspots' for active air pollution reduction, positioning the product as infrastructure rather than a one-off installation.
The 2017 MossTree Phase 1 describes the product as 'smart city climate infrastructure,' indicating sensor integration and data-driven operation alongside the biological filtration.
The organisation completed both Phase 1 (feasibility, EUR 50,000) and Phase 2 (market entry, EUR 1,270,850) of the H2020 SME Instrument with the same product — a rare full progression that signals genuine commercial traction.
Green City Solutions has a tightly focused, single-product trajectory rather than a broadening portfolio. Between 2017 and 2019 they moved the MossTree concept from feasibility study (SME Phase 1) to full commercialisation (SME Phase 2), increasing funding by a factor of 25. Because both projects share the same name and description, the evolution is less about changing topics and more about deepening market readiness — from "can this work?" to "how do we scale and sell it?" No pivot or diversification is visible in the H2020 record.
They are on a commercialisation trajectory with a single, validated product — future collaborations are most likely with cities, urban mobility operators, or smart city integrators rather than research consortia.
Green City Solutions operates as a solo innovator, not a consortium builder — both H2020 projects were coordinated by them alone with zero recorded consortium partners. This is characteristic of the SME Instrument, which funds individual companies rather than research networks. Working with them likely means engaging directly with their product team rather than entering a multi-partner project structure.
No consortium partners are recorded across their two H2020 projects, reflecting the solo-company design of the SME Instrument funding scheme they used. Their collaborative network, if any, exists outside the H2020 record — likely through city pilot programmes, distribution partners, or industry associations not captured here.
Green City Solutions is one of the very few organisations in Europe that has taken a biofilter air purification product all the way through the EU SME Instrument from concept to commercialisation — a process fewer than 5% of applicants complete. Their MossTree product occupies a niche between passive urban greening (trees, green walls) and mechanical air filtration systems, offering something measurable and modular that neither category provides alone. For partners looking to add an air quality component to a smart city, mobility, or climate adaptation project, they bring a market-ready technology rather than a research prototype.
