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Indoor air quality monitoring for schools and public buildings

To ensure health, comfort, and safety within your facilities

Whether you manage schools, hospitals, offices, or shopping centers, you face significant challenges in maintaining air quality. Your facilities, with their diverse range of equipment and materials—such as cleaning products, HVAC systems, medical chemicals, and construction materials—are sources of various emissions. These include volatile organic compounds (VOCs), fine particulates, gases like CO2, CO, and NOx, as well as airborne pathogens. Odors, which often signal underlying issues, also affect indoor air quality, even in less visible areas like restrooms and corridors, where stringent cleanliness and safety standards are crucial.

Ellona offers a comprehensive solution to t

hese challenges. We provide advanced expertise in detecting and quantifying both odor and environmental nuisances, and in analyzing physico-chemical footprints and environmental signatures. Our state-of-the-art technologies deliver continuous monitoring of gas emissions, particulate matter, noise, and odors, ensuring a healthier and more comfortable environment for your occupants.

Our systems are designed to quickly identify anomalies, allowing you to implement proactive measures and corrective actions as needed. With Ellona, you gain a trusted partner dedicated to upholding the highest standards of air quality, ensuring that your spaces remain not only compliant with regulations but also conducive to a safe and productive environment.

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A one-of-a-kind approach for your operations

Mall avec indices de confort, confinement et transmission virale
01

Real-time multi-variate analysis.

With our environmental intelligence platform, Ellona transforms raw data into actionable insights with unparalleled precision. By processing data updates every 10 seconds, we continuously analyze a wide range of variables. Our unique strength lies in multi-variate analysis, which provides a comprehensive and deep understanding of the phenomena at hand, leading to more effective and impactful actions for businesses and communities.

Ellona: Identification des odeurs, détergent, tabac, salle de bain
02

Identification and triangulation of footprints and sources.

The artificial intelligence algorithms and databases developed by Ellona go far beyond simple quantification. We excel in the precise identification of odor, gas, and particulate sources, whether they are dispersed in the air or concentrated in specific locations. Data triangulation is at the core of our approach, allowing us to cross-reference information and pinpoint these sources with high accuracy in indoor environments.

Mall avec indices de confort, confinement et transmission virale
03

Indoor air quality indices.

The Ellona solution integrates precise measurements of multiple parameters, such as odor levels, gases, fine particles, temperature, and humidity. These data are then analyzed to generate decision-support indices, such as the confinement index, which assesses ventilation and pollutant accumulation, and the viral index, which estimates the risk of pathogen spread in indoor air. With these indices, managers can take proactive measures to ensure a healthy and safe indoor environment.

Personnes au travail, transmission virale, bureau, Ellona.
04

Smart alerts and customized notifications.

Our platform allows for real-time configuration of various types of alerts tailored to each user’s specific needs. Additionally, the automatic generation of smart reports ensures optimal responsiveness to any critical situation.

Bureau d'Ellona avec des fenêtres ouvertes, plusieurs employés travaillant.
05

Automation of remediation systems.

Thanks to the integrated API, the Ellona solution provides proactive management of indoor air quality by automating the activation of third-party systems. Whether it’s for ventilation, heating, window opening, or adjusting air purification systems, our solution ensures a rapid and effective response based on detected variations in the indoor environment. This helps maintain optimal conditions in real-time, reducing indoor pollution risks and ensuring increased comfort and safety for occupants.

Bureau moderne avec employés, perception des employés sur le froid et les odeurs de cuisine.
06

Integration of human perceptions via QR codes.

Ellona enhances its analyses by integrating human perceptions collected via QR codes. These subjective data are then correlated in real-time with the technical data collected by our systems, providing a comprehensive and nuanced view of the situations for even more precise interventions.

Examples of KPIs for facilities using Ellona solutions

25%

reduction in VOC emissions

through proactive management of cleaning products and office equipment, based on real-time monitoring of VOC levels in indoor environments.

30%

reduction in fine particles emissions from office equipment and HVAC systems

by using monitoring data to optimize performance and reduce emissions.

20%

improvement in customer satisfaction

through the optimization of cleaning routines based on real-time monitoring of cleanliness, hygiene, and safety of indoor environments.

15%

reduction in energy consumption for heating, ventilation, and air conditioning (HVAC) systems

by adjusting operational parameters based on environmental monitoring data.

10%

increase in operational efficiency

by quickly identifying and addressing indoor air quality issues through continuous monitoring and real-time alerts.

20%

savings on costs related to work stoppages due to occupational illnesses

by improving indoor air quality and reducing health risks for occupants.

25%

optimization of chemical product use

through precise emission monitoring and identification of more eco-friendly and lower-emission alternative solutions.

20%

reduction in odor complaints

through proactive management based on monitoring odor levels and identifying potential problem sources.

Complex emission sources that we address

Establishments and public venues, such as schools, hospitals, offices, and shopping centers, face a range of complex atmospheric emissions:

  • Cleaning products: Essential for maintaining cleanliness, these often contain volatile organic compounds (VOCs) and other chemicals that are released into the air during use, contributing to indoor pollution.
  • Office equipment: Devices like printers, copiers, and electronics emit fine particles and VOCs during operation, which can degrade air quality and affect occupant health.
  • Heating, Ventilation, and Air Conditioning (HVAC) systems: Crucial for regulating indoor climate and air quality, these systems can also emit gases such as carbon dioxide (CO2), carbon monoxide (CO), and nitrogen oxides (NOx) if not properly maintained.
  • Healthcare chemicals: Healthcare facilities use various chemicals, including disinfectants, sterilizers, and pharmaceuticals, which can release harmful substances into the air.
  • Construction and renovation materials: Materials like paints, adhesives, flooring, and insulation can emit VOCs and other chemicals both during and after installation, potentially affecting indoor air quality over time.
  • Airborne pathogens and odors: Alongside chemical pollutants, establishments must also manage airborne pathogens and odors, which can signal underlying issues with hygiene or ventilation.

Effective management of these emission sources is vital for maintaining a safe, healthy indoor environment. At Ellona, we are dedicated to identifying, quantifying, and managing these emissions, ensuring that all types of establishments remain welcoming, healthy, and productive spaces.

They trust us: see our deployments for a school in northern France, public buildings in Taiwan and JCDecaux public toilets.

Further reading: read our articles on improving air quality in schools, funding air quality projects with ADEME and the dangers of poor indoor air quality.

Complete guide: CO2, VOCs, particles, odors and noise explained in our indoor air quality guide.

Types of facilities we work with:

Établissements publics

Public establishments

Administrative offices, libraries, museums, sports centers, public swimming pools, theaters, cinemas, train stations…

Hopitaux

Healthcare facilities

Hospitals, clinics, nursing homes, laboratories…

Secteur accueil , écoles

Schools and daycare centers

High schools, middle schools, preschools…

Centre commercial

Shopping centers

Shopping mall

Picto restauration

Restaurants

Bureaux et infrastructures

Offices

Ellona designs tailored products for establishments and public venues.

Capteur POD2
Plateforme EllonaSoft

Ellona designs specialized products for establishments and public venues. We offer a comprehensive range of real-time monitoring technologies, including the POD2 and our EllonaSoft platform, specifically developed for these settings. These tools enable precise quantification and identification of atmospheric emission sources within buildings.

They facilitate continuous monitoring to optimize environmental, health, technical, and economic performance while enhancing comfort, health, safety, and cleanliness of the spaces. Through targeted corrective measures, they ensure proactive environmental management, strict compliance with regulatory standards, and reinforce commitment to economic and environmental sustainability.

The key parameters we monitor in facilities:

Gaz

Gases

E.g : NOx, CO₂, CO, COV…

odeur

Odors

Detection, intensity, identification of signatures and sources

particules

Particles

PM10, PM2.5, PM1

bruit

Noise

temperature

Temperature

Humidité

Humidity

Lumière

Light

Our use cases in this sector

View all news

Air quality and indoor environment monitoring in public buildings in Taiwan

Advanced monitoring of classrooms and restrooms in a school in Hauts-de-France – France

Advanced monitoring of JC Decaux’s sanitation units – France

Advanced security and environmental monitoring at Hanyang University – South Korea

Our commitment
for the establishments

With our expertise in odor and environmental nuisance management, and in physicochemical footprint analysis, we offer comprehensive and tailored solutions:

  • Advanced monitoring: Utilization of cutting-edge technology for real-time surveillance of gases, fine particles, odors, and other critical indoor air quality parameters.
  • Instant alerts: Immediate notifications when critical thresholds are exceeded, ensuring a rapid response to potential emergencies.
  • EllonaSoft platform: Easy access via smartphone for centralized data management, facilitating informed and responsive decision-making.
  • In-depth analysis: Examination of collected data to identify pollution sources, assess health and environmental impacts, and provide customized solutions.
  • Personalized support: Solutions tailored to each client’s specific needs, ensuring seamless integration and optimal results.
  • Long-term commitment: Sustainable partnerships with continuous monitoring and proactive anticipation of needs for effective environmental challenge management.

By choosing Ellona, you select a partner committed to ensuring safe indoor environments that meet the highest environmental standards while optimizing your resources and enhancing the sustainability of your establishment.

The benefits
of our products for your operations

Our support for establishments and public venues offers significant gains in several key areas:

Health and environmental gains:

  • Proactive detection and accurate identification of nuisances and pollutants (gases, odors, particles, noise).
  • Reduction in the risk of respiratory diseases and other conditions related to air quality.
  • Minimization of accident and occupational illness risks, enhancing the safety and well-being of employees, students, and visitors.
  • Compliance with and reinforcement of safety standards for a healthy and secure working environment.

Economic and financial gains:

  • Improved concentration, reduced fatigue, and optimized performance of employees and students.
  • Decrease in absenteeism due to health reasons.
  • Significant reduction in energy costs through optimized heating, ventilation, and air conditioning systems.
  • Reduction in costs associated with healthcare and absenteeism.

Technical gains:

  • Effective planning of maintenance and cleaning activities.
  • Maintenance of high standards of cleanliness and comfort, improving occupant satisfaction and the establishment’s reputation.
  • Use of the EllonaSoft platform for continuous monitoring and proactive air quality management.

By choosing Ellona, you invest in solutions that enhance the quality of life and safety within your premises, optimize your resources, and strengthen the overall sustainability of your establishment.

Regulatory standards for establishments and public venues

To ensure optimal indoor air quality in facilities and public venues, it is essential to consider not only concentrations of chemical pollutants but also other parameters such as humidity and noise levels. Here are the typical recommended values for these various parameters:

  • Volatile Organic Compounds (VOCs):
    • Recommended Limit: Less than 300 μg/m³ for total VOCs in indoor air, according to the World Health Organization (WHO) recommendations.
  • NO₂:
    • Short-term Exposure (1 hour): Often between 100 to 200 µg/m³ according to local regulations.
    • Long-term Exposure (1 year): Around 40 to 50 µg/m³ on average..
  • CO:
    • Short-term Exposure (8 hours): Standard generally below 10 mg/m³ (or 8.7 ppm) to protect against acute toxic effects.
    • Long-term Exposure (1 year): Standard often set at 1 to 5 mg/m³ (or 0.9 to 4.4 ppm) on an annual average to protect long-term health.
  • CO₂ :
    • Recommendation: Keep CO₂ levels below 1000 ppm to ensure proper air ventilation.
  • Fine Particles (PM₂.₅ and PM₁₀):
    • Recommended limit: In Europe, the annual average concentration of PM₁₀ should not exceed 40 µg/m³, and for PM₂.₅, the standard is 25 µg/m³ on an annual average basis, according to European Directive 2008/50/EC.
  • Relative humidity:
    • Recommendation: Maintain relative humidity between 40% and 60% to prevent mold growth and ensure occupant comfort.
  • Noise levels:
    • Recommendation: Noise levels should be kept below 35 dB(A) in areas where high concentration is required, such as work zones.

Your questions, our solutions

How to accurately measure, identify, and locate noise indoors?

Indoor noise management is essential for safety and comfort. It’s not just about measuring sound levels but also accurately identifying the sources and nature of the noise to tailor remediation strategies.

Ellona’s POD2 devices play a key role in acoustic monitoring and indoor safety, whether in offices, hospitals, factories, schools, or commercial spaces.

  • Continuous measurement of sound levels to ensure a compliant environment
  • Identification of noise sources (machines, voices, barking, alarms, ventilation…)
  • Detailed analysis of the nature of the noises (impulsive, resonant, mechanical…)
  • Detection of critical noises (gunfire, security alarms, glass breakage, technical incidents…)
  • Targeted remediation to secure infrastructure and protect people

With EllonaSoft, data is centralized, analyzed, and utilized in real-time, enabling fast and efficient decision-making in the event of an incident.

Learn more

How to accurately measure, identify, and locate odors (odours) indoors?

The management of indoor odor (odour) nuisances is based on three essential aspects:

  • Real-time odor (odour) detection to identify any anomalies
  • Measurement of odor (odour) intensity to track their evolution and impact
  • Accurate identification of the nature of odors (odours) and their sources for quick and targeted remediation

Ellona’s  POD2  is an advanced solution that continuously analyzes indoor air through a combination of MOS sensors and smart algorithms. This enables the anticipation and effective management of odor (odour) nuisances in sensitive environments such as offices, hospitals, laboratories, industrial kitchens, or commercial spaces.

All collected data is centralized, analyzed, and utilized through the EllonaSoft platform. This powerful tool enables real-time monitoring, rapid identification of odor (odour) nature and sources, and optimization of remediation strategies, ensuring better control of odor (odour) nuisances and healthier indoor air.

Learn more

How to measure, identify, and locate fine particles, including PM1, PM2.5, and PM10, indoors?

Ellona’s POD2 enables real-time indoor measurement of fine particles (PM1, PM2.5, PM10, and down to PM0.3) using optical sensors. These sensors detect and count particles by measuring light scattering, providing precise air quality monitoring. In addition to measuring particle concentration, the POD2 leverages artificial intelligence algorithms to identify their nature and source, helping to better understand pollution origins and optimize remediation actions. Data is centralized and analyzed via EllonaSoft, ensuring optimized health risk management and real-time monitoring to protect occupants’ safety.

The POD2 specifically monitors fine particle levels in line with WHO recommendations:

  • PM2.5: ≤ 5 µg/m³ (annual average exposure)
  • PM10: ≤ 15 µg/m³ (annual average exposure)
  • PM1: Few official guidelines, but high concentrations can be concerning.

This capability of measurement, analysis, and identification enhances the understanding of indoor pollution challenges and enables the effective adaptation of air quality improvement strategies.

Learn more

How to measure, identify, and precisely locate gas emissions indoors?

Ellona’s POD2 ensures the safety of people and infrastructure by monitoring indoor air quality through real-time multivariate analysis. It measures up to 5 gases simultaneously (4 electrochemical sensors + 1 optical sensor) from a list of 21 possible gases (NO₂, SO₂, CO, O₃, NH₃, etc.). Its artificial intelligence algorithms accurately identify gas types, detect their interactions, and locate their sources. Through the EllonaSoft platform, smart alerts and automated corrective actions (ventilation, air purification) are implemented, ensuring a healthier environment, optimal occupant protection, and infrastructure preservation.

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Is the analysis of NH3 and H2S molecules enough to qualify and quantify odors (odours)?

No, the analysis of H2S (hydrogen sulfide) and NH3 (ammonia) molecules is not sufficient to assess all odors (odours) present in an environment. Although these molecules are commonly analyzed using electrochemical sensors, they only represent a fraction of the odor (odour) compounds. Hydrogen sulfide and ammonia are indeed important components of certain odor (odour) nuisances, but many other chemical compounds are responsible for varied and complex odors, such as aldehydes, volatile fatty acids, and mercaptans, which are not detected by these traditional technologies. This is precisely what the MOX (Metal Oxide Semiconductor) sensors used in Ellona devices, such as the WT1 Lite, the WT1 Pro (specifically designed for outdoor use), and the POD2 (adapted for indoor environments), are capable of detecting.

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Our latest news

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Ellona wins four awards at the 2025 AIRLAB Microsensors Challenge.

Ellona joins the Clean Tech for Clean Air (CT4CA) coalition

Smart management of odors and gases: real-time dispersion and multivariate analysis at waste treatment sites

ELLONA methodology for the calibration of WT1 devices

Ellona in Latin America: A tour at the heart of environmental innovation and odour management

Ellona featured on France 24: Environmental Intelligence for a safer and healthier world.

Air pollution: A major health and economic impact!

ELLONA awarded at the Smart City Galaxy 2024 Congress

ELLONA joins the 380 Deeptech and Greentech start-ups shaping the future of decarbonization and reindustrialization!
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