What Green City Solutions does

Green City Solutions GmbH is a German biotech company founded in 2014 and headquartered in Bestensee, Germany (with a Berlin address and an on-site moss farm). The company develops and deploys moss-based bio-digital air purification systems that combine vertical living moss mat modules with integrated IoT sensors to filter fine particulate matter, reduce CO2e, and deliver passive evaporative cooling in urban environments. Its product portfolio includes CityBreeze (an outdoor totem with integrated bench and digital DOOH screen), WallBreeze (interior wall-mounted), CityTree (freestanding outdoor), and MicroBreeze (compact unit). Per-unit performance is stated at up to 5,000 m³/hr air filtration, 82% fine dust reduction, up to 6,500 W/hr evaporative cooling (equivalent to -4°C), and 342 kg CO2e reduction per year on a 9 m² footprint comparable to 81 trees.

The company runs a three-stream revenue model: (1) hardware sales of CityBreeze/WallBreeze/CityTree/MicroBreeze units installed under multi-year contracts (commonly 5-year terms); (2) recurring maintenance, moss cultivation, and managed-service agreements; and (3) advertising revenue via climAD, Germany's first green Digital Out-of-Home (DOOH) network embedded in CityBreeze installations. Distribution is project-based and quote-driven, executed primarily through direct enterprise field sales targeting shopping center operators (VICUS, GRR GARBE, Jost Hurler, EDU Bremen, Melchendorfer Markt, NordseePassage, Elbgalerie Riesa, Intro Bergheim), commercial and logistics real estate developers (Panattoni, Baytree), municipal governments (Meiningen, Wittenberg), and healthcare/senior-living facilities (Diakonie Hamburg). Primary market focus is DACH, with documented international projects in the UK (Leeds, Hereford), Ireland (Cork), and Malta.

The company is privately held and has raised growth financing from Heinz Dürr Invest GmbH plus capital from 610 private investors (2022), followed by a pre-Series B crowdfunding round on Companisto in July 2025. Green City Solutions has accumulated significant third-party validation, including the EXPO REAL Impact Awards 2025 (Category and Overall Winner), SZ Institut's 'Germany's Most Innovative Companies' 2025 and 2026, the Possehl Engineering Award 2025 for MicroBreeze, and the UN Tourism Malta Innovation Challenge 2026, alongside a Bundespreis 'Blauer Kompass' 2026 nomination for climate adaptation.

Name

Green City Solutions

Legal name

Green City Solutions GmbH

Website

https://greencitysolutions.de

Company type

Private

Founded year

2014

Operating status

Operating

Headcount range

11–50 employees

Short description

Green City Solutions GmbH is a German biotech company that develops moss-based bio-digital air purification systems (CityBreeze, WallBreeze, CityTree, MicroBreeze) with integrated IoT sensors and the climAD DOOH advertising network, serving retail real estate operators, municipalities, and commercial property developers across DACH and select European markets.

Ownership category

akta.pro rank

Product category

Urban Air Purification & Bio-Digital Cooling Systems

NAICS

Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing (33341), Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use (334512)

SIC

Industrial & Commercial Fans & Blowers & Air Purifing Equip (3564), Auto Controls For Regulating Residential & Comml Environments (3822)

akta.pro primary industry

Industrial & Commercial Luminaires (High-bay, Low-bay, Troffers, Downlights) (IMAGAIAA)

akta.pro secondary industry

Controller/Timer & Smart Irrigation Setup (Wi‑Fi, Sensors) (HSAIAEAD)

Keywords

• Moss air filtration
• Urban air purification
• Bio-digital cooling
• Evaporative cooling systems
• Green DOOH advertising

Headquarters

HQ city

Bestensee

HQ country

Germany

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Technology or R&D, Personnel, Operations, Marketing or Sales, Infrastructure

Revenue model

1. Bio-digital air filtration product sales: Sale of CityBreeze (outdoor totem with bench), WallBreeze (interior wall-mounted), and CityTree (freestanding outdoor) units. Products installed at customer sites under multi-year contracts (e.g., 5-year terms). Revenue from equipment, installation, and initial setup. Custom project-based pricing varies by site, module count, and configuration.
2. Maintenance and service contracts: Ongoing moss cultivation, module replacement, sensor calibration, and system monitoring services bundled with installations under multi-year service agreements. Ensures continuous moss viability and performance.
3. climAD DOOH advertising network: climAD is Germany's first green DOOH advertising network, operated by Green City Solutions. Revenue generated from selling digital advertising screen time on CityBreeze units installed at customer locations. Partners include major DOOH players contributing pro bono media space for social causes. Provides digital communication capability as a value-add to hardware customers.

Pricing tiers

Go-to-market motion3 records

Distribution channels4 records

Marketing channels8 records

Core offering

Green City Solutions manufactures and installs proprietary moss-based bio-digital air filtration and cooling systems (CityBreeze, WallBreeze, CityTree, MicroBreeze) that combine living vertical moss mat modules with IoT sensor monitoring and integrated digital screens. Units are sold to commercial real estate owners, shopping centers, municipalities, logistics developers, and healthcare facilities, bundled with multi-year maintenance contracts. The company also operates climAD, Germany's first green digital out-of-home (DOOH) advertising network, integrated into the CityBreeze hardware.

Product overview

Green City Solutions offers a modular bio-digital air filtration system centered on living moss technology. The core product CityBreeze combines vertical moss modules for air purification and evaporative cooling with integrated digital screens (climAD) for communication. Related products include WallBreeze for indoor applications and CityTree for outdoor installations. The company positions itself as offering the world's first regenerative bio-air filters, delivering up to 5,000 m³/hr air filtration, 6,500 W cooling, and 82% particulate reduction on a compact 9 m² footprint equivalent to 81 trees.

Differentiator

Problem solved

Functional benefit

Brands

• CityBreeze: Bio-digital air filter and cooler combining moss modules with digital DOOH displays for urban spaces.
• climAD
• CityTree
• WallBreeze
• MicroBreeze

Products and services

• CityBreeze Modular bio-digital outdoor air filter and cooler combining vertical moss mat modules with integrated digital screens (climAD DOOH) and bench seating. Delivers up to 5,000 m³/hr air filtration, 82% fine dust reduction, 6,500 W/hr cooling, and 342 kg CO2e/year reduction on a 9 m² footprint. Sold to commercial real estate owners, shopping centers, and municipalities under multi-year contracts (e.g., 5-year terms).
• WallBreeze Interior wall-mounted air purification system using vertical moss modules for fine dust filtration and natural evaporative cooling. Targeted at indoor environments including healthcare and senior living facilities (e.g., two WallBreeze units installed at Christophorus House of Diakonie Hamburg for natural heat protection and clean air).
• CityTree Original outdoor moss-based air filter and cooler unit for urban spaces, using living moss to filter fine dust and reduce ambient temperature. Deployed at sites including Wittenberg Schlossplatz (UNESCO World Heritage), Panattoni City Dock Kirchheim near Munich (logistics real estate), and Baytree Leeds in the UK.
• MicroBreeze Compact moss-based air filtration unit, a smaller-scale iteration of the company's bio-filter product family. Positioned for green innovation in livable cities and supported by the 2025 crowdfunding round.
• climAD Germany's first green digital out-of-home (DOOH) advertising network, operated by Green City Solutions and integrated into CityBreeze hardware installations. Generates revenue by selling digital advertising screen time on CityBreeze units deployed at customer locations. Partners include major DOOH players (Weischer.OOH, planus media, WallDecaux, OCEAN Outdoor, Flughafen München, add2 GmbH, INOVISCO, eisbach.media, Cittadino, Rechargy, TV-Wartezimmer, UNICUM TV, ECN, Deutsche Hochschulwerbung) contributing pro bono media space for social cause campaigns (e.g., Pelorus Jack Foundation rainforest protection campaign with ~1 million euros of media space mobilized).
• Maintenance and service contracts Multi-year service agreements bundled with CityBreeze, WallBreeze, CityTree, and MicroBreeze installations. Services include ongoing moss cultivation and module replacement, sensor calibration, system monitoring, predictive maintenance, and ESG performance reporting for customers. Typically delivered as 5-year contractual agreements.

Quantifiable outcome

• Air filtration capacity of up to 5,000 m³/hr equivalent to 81 trees on 9 m² footprint
• +5 more outcomes

Named customers12 records

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability2 records

Feature5 records

Partnerships

13 partnerships are on record, tiered core/flagship, core, innovation partner, strategic, ecosystem partner, strategic partner, cause marketing partner and marketing partner.

• GRR GARBE Retail Real Estate GmbHcore/flagshipStrategic or Co-development Partner · 1 January 2026Long-term strategic partnership for sustainable retail real estate. Multiple projects completed: Einkaufspark Duckwitz Bremen (EDU) and NordseePassage Wilhelmshaven. GRR GARBE operates retail real estate across Germany and is integrating CityBreeze and climAD as ESG and sustainability measures. Partnership described as representing 'langfristiges Denken und die gemeinsame Vision für eine grünere und lebenswertere Stadt.'
• VICUS Asset GmbHcore/flagshipStrategic or Co-development Partner · 1 January 2026Real estate asset manager for Gohlis Arkaden shopping center in Leipzig. Five-year CityBreeze contract. VICUS positioning the partnership as part of modernizing the district center with sustainable digital infrastructure and climate adaptation. Oliver Hegedüsch cited the solution as aligned with their vision for the Gohlis Arkaden.
• Jost Hurler GruppecoreStrategic or Co-development Partner · 1 January 2026Real estate management company for Storkower Bogen in Berlin-Lichtenberg. Pursues long-term strategy of first-class architecture and modern building technology. CityBreeze installation completes the innovation and digital concept. Jens Fritsche (Centermanager) has collaborated on multiple projects including Erfurt Melchendorfer Markt.
• ZIM Innovationsnetzwerk Funktionsfassadeinnovation partnerStrategic or Co-development Partner · 1 January 2026ZIM (Zentrales Innovationsprogramm Mittelstand) Innovation Network for Functional Facades. Green City Solutions participates as part of sustainable and climate-friendly urban development R&D collaboration. Fabian Wiggers presented at ZIM network annual conference.
• Global Goals & EXPO Berlin 2035strategicStrategic or Co-development Partner · 1 January 2026Green City Solutions became a member of Global Goals & EXPO Berlin 2035 initiative. Mission: 'All of Berlin a World Expo!' Initiative positions Berlin as a world expo site demonstrating future solutions. CityBreeze featured on tagesthemen news program as a green vision for Berlin.
• climAD Partner DOOH Network (Weischer.OOH, OCEAN Outdoor, WallDecaux, etc.)ecosystem partnerGTM or Marketing Partner · 1 January 2026DOOH media providers including Weischer.OOH, planus media, add2 GmbH, Flughafen München, INOVISCO, eisbach.media, Cittadino GmbH, Rechargy, OCEAN Outdoor Germany GmbH, WallDecaux, TV-Wartezimmer, UNICUM TV GmbH, ECN, Deutsche Hochschulwerbung. Contributed pro bono media space (valued at ~1 million euros) for Pelorus Jack Foundation DOOH campaign. ecosys
• IDOOH Institute for Digital Out of Home Mediastrategic partnerGTM or Marketing Partner · 1 January 2025Industry platform for digital out-of-home media that initiated the Pelorus Jack Foundation DOOH campaign. climAD participated as a partner providing green DOOH media space. IDOOH orchestrated DOOH media space worth over 1 million euros for the rainforest protection campaign. Multiple DOOH providers contributed pro bono.
• It Works Groupstrategic partnerGTM or Marketing Partner · 1 January 2025German agency that initiated and creative-directed the Pelorus Jack Foundation DOOH campaign together with IDOOH. Provided creative production and campaign management for the DOOH initiative supporting rainforest protection on Borneo.
• Pelorus Jack Foundationcause marketing partnerGTM or Marketing Partner · 1 January 2025Foundation founded by actor and environmental activist Hannes Jaenicke for rainforest protection on Borneo. climAD by Green City Solutions supported the foundation with DOOH advertising, bringing the rainforest protection message into public spaces in Germany. DOOH media space valued at ~1 million euros mobilized.
• Melchendorfer Markt (Erfurt)coreStrategic or Co-development Partner · 1 January 2025Shopping center in Erfurt that hosted the first CityBreeze premiere — Germany's first long-term outdoor CityBreeze installation. First digital screen in the center environment. Jens Fritsche (Centermanager) collaboration extended to Storkower Bogen project.
• Panattoni GermanycoreStrategic or Co-development Partner · 1 January 2025Leading logistics real estate developer partnering with Green City Solutions for sustainable air quality at City Dock Kirchheim near Munich. First CityTree at a Panattoni logistics property. Focus on sustainable logistics real estate standards.
• Baytree Leeds (UK)coreStrategic or Co-development Partner · 1 January 2025Logistics real estate operator in the UK. First CityTree installation for sustainable logistics real estate at Baytree Leeds site. Green City Solutions and Baytree set new standards for sustainable logistics real estate.
• NRW Retail Association (Handelsverband NRW)marketing partnerGTM or Marketing Partner · 1 January 2025The NRW Retail Association uses climAD on CityBreeze for advertising and communication. Cited positive feedback ('We are excited') regarding the climAD platform. Demonstrates climAD's B2B marketing channel value.

Scale indicators10 records

Recent moves6 records

Expansion highlights6 records

Emerging players

• BreezoMeter: Air quality data and analytics company providing real-time environmental intelligence. Comparable data layer for air quality ESG reporting that Green City Solutions offers to enterprise customers; partial overlap in monitoring/monetization approach.
• Airlabs: Air purification technology company focused on urban air quality solutions for cities. Comparable mission around urban air pollution remediation, though uses different (filter-based) technology rather than bio-digital moss approach.
• Treeconomy: UK-based startup providing tree-planting and nature-based carbon offset solutions with measurement and verification technology. Competes for ESG-driven urban greening budgets from municipalities and corporates, offering traditional nature-based alternatives to moss technology.
• Clarity Movement: Air quality sensor and monitoring network provider for cities and enterprises. Comparable IoT/sensor-driven environmental monitoring capability that complements air quality infrastructure; partial overlap in target customers (municipalities, real estate).
• Pluvo: European urban climate adaptation startup focused on cooling solutions for cities. Comparable focus on mitigating urban heat island effect, though via different mechanisms (water-based misting vs. evaporative moss cooling).

Direct peers

• Mobilane: Netherlands-headquartered living wall and green facade specialist serving European commercial real estate. Comparable offering in vertical plant-based installations for air quality and building aesthetics; competes for similar European B2B customers.
• Biotecture: UK-based provider of living wall and green infrastructure systems for commercial buildings. Directly comparable to Green City Solutions' WallBreeze and CityTree units as both deliver plant-based air quality and aesthetic benefits to urban built environments.
• Sage Greenlife: US-based living wall and biophilic design company providing moss and plant-based interior installations. Comparable technology platform (living moss walls) and target customer segments (commercial real estate, corporate interiors).

Broad incumbents

• IQAir: Global air quality and air purification company with industrial and commercial solutions. Serves the same urban air quality need but through HEPA/filtration technology; broader portfolio and significantly larger scale than Green City Solutions.
• Ströer: Germany's largest out-of-home (OOH) advertising company operating DOOH networks. Comparable DOOH/advertising inventory through traditional digital screens; a potential competitor or partner for climAD's green DOOH network positioning.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/greencitysolutions
• Xx.com/mycitytree

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Funding overview

Funding rounds7 records

Investors8 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Green City Solutions