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LoRaWAN-Based Air-Quality Monitoring & Contact Tracing In Public Buildings Shows Promise for Controlling Viruses’ Spread

Kerlink and Partners Deploy Internet of Things Project That Demonstrates How Building Owners Can Help Limit Covid-19 Transmission & Future Outbreaks of Viruses

May 5, 2022, 06:00 p.m. CEST – Combining off-the-shelf IoT technologies and equipment with new mathematical models that simulated the propagation of Covid-19, a pilot solution at a leading Paris university hospital center has demonstrated how building managers in the future can limit the spread of viruses such as Covid-19.

The eight-month trial in 2021 included nearly 200 students and about 20 staff volunteers who wore Bluetooth-enabled badges during their classes, labs and shifts at the Faculty of Medicine (medical school) at Kremlin-Bicêtre AP-HP (Assistance Publique-Hôpitaux de Paris).

In addition to continuous monitoring of building air-quality, the system monitored occupants’ movements and whereabouts using dedicated mathematical models developed by two Paris-Saclay University scientists. These models simulated the propagation of Covid-19 in the student population, based on contact-tracing matrices.

“This made it possible to investigate the importance of actual contacts between individuals in the transmission process, and more generally to estimate the role of the population’s actions, such as gathering in ill-ventilated rooms and the length and type of communication – casual short conversation or longer collaboration – between individuals in the overall spread of the epidemic,” said Bertrand Maury, who along with colleague Sylvain Faure, created the algorithms. “This evaluation clearly showed this IoT-based solution can help building managers in the future to limit the spread of viruses such as Covid-19.”

The contact-tracing application in the buildings was paired with air-quality monitoring that included:

  • CO2 levels in the premises in relation to occupancy rates and hours, and ventilation adjustments,
  • Malfunctions in the ventilation or required maintenance of ventilation equipment, and
  • Hourly renewal rate (HRR), or complete renewal of the air in a room, which is a key performance indicator (KPI) monitored by building managers in their day-to-day operations.

The contact-tracing matrices were inspired by an algorithm developed by France’s National Center for Scientific Research (CNRS) and Paris-Saclay University that defines epidemiological models for virus transmission. It also provides a first assessment of the influence of CO2 concentration as an indicator of poor air quality that may accelerate viral transmission, e.g. a CO2 level indicating insufficient indoor air renewal.

The pilot project at Kremlin-Bicêtre AP-HP has been validated by the clinical research unit of the Paris-Saclay Faculty of Medicine, while the protection of private data and the identities of the pilot-project participants fully complied with GDPR law.

Prof. Olivier Lambotte, vice dean of the Faculty of Medicine at Kremlin-Bicêtre AP-HP, said Covid-19 virus transmission and the desire to develop an “improved-alerting” tool based on epidemiologic models were the initial triggers for this demonstrator project and they have been successfully completed with air-quality monitoring through CO2-level analysis.

“After these initial results, the Faculty of Medicine will be able to refine its systems for combatting the spread of epidemics thanks to a better knowledge of the interactions between students and thanks to a mastery of air quality,” he said. “Mathematical modeling of air renewal in a classroom or amphitheater allows us to estimate in advance the maximum number of people who can be present to maintain a CO2 level below a set threshold.”

The system used technology jointly developed by Kerlink (AKLK – FR0013156007), a specialist in solutions dedicated to the Internet of Things (IoT), Microshare, a provider of a leading data-management solutions for the IoT era, and Enless Wireless, a major manufacturer of intelligent self-powered sensors, communicating in radio mode and dedicated to energy performance & comfort applications in buildings.

The LoRaWAN-based system used Kerlink Wanesy™ Wave, a multi-purpose powered anchor – combining Wi-Fi, BLE and LoRaWAN®, for contact-tracing data collection from Bluetooth badges – and a Kerlink Wirnet™ iFemtoCell indoor gateway to transmit the data to Microshare’s Universal Contact Tracing® application, which ensures end-to-end security, privacy and reliability for the delivery of critical information where it’s needed. The data it produces is GDPR-compliant and delivered through Microshare’s patent-pending rules and sharing engine to only appropriate, designated people in the organization at the right time. Enless Wireless provided the pilot project with easy-to-install and connect indoor air-quality transmitters with embedded CO2 sensors and high-performance D-type batteries.

About Kerlink

Kerlink Group is a leading global provider of end-to-end connectivity solutions for designing, deploying, and operating public & private low power/wide area (LPWA) Internet of Things (IoT) networks. Its comprehensive product portfolio includes industrial-grade network equipment, best-of-breed network core, operations and management software, value-added applications and expert professional services, backed by strong R&D capabilities. Kerlink specializes in enabling future-proof intelligent IoT connectivity for three major domains: Smart City & Quality of Life – urban operations, utilities & metering, retail & public places, infrastructure & hubs, health; Smart Building & Industry – buildings & real estate, industry & manufacturing, asset monitoring & tracking, and Smart Agriculture & Environment – precision agriculture, cattle monitoring & farming, environment & climate, and wildlife protection. More than 200,000 Kerlink installations have been rolled out with over 350 clients in 70 countries. Based in France, with subsidiaries in the US, Singapore, India and Japan, Kerlink is a co-founder and board member of the LoRa Alliance® and the uCIFI Alliance™. It is listed on Euronext Growth Paris under the symbol ALKLK.

For more information, visit or follow us on our social media – Twitter @kerlink_news, LinkedIn #Kerlink, YouTube – Kerlink

About Microshare

Microshare® provides Smart Building data solutions at scale that enhance safety, wellness and sustainability, and drive cost savings and efficiencies across the world. Our EverSmart suite of solutions produces real-time insights where none previously existed in areas such as occupancy monitoring, energy consumption, customer satisfaction, environmental safety and more. Microshare is a proud member of the LoRa Alliance®.

About Enless Wireless

Enless Wireless is a leading automation and IoT French player in building energy efficiency & comfort for more than 12 years. It manufactures a catalogue of wireless radio sensors, based on the main LPWAN radio protocols LoRa, Sigfox, Wireless M-Bus. With Enless Wireless’s range of standalone wireless sensors LoRaWAN®, European system integrators can quickly and simply build their own private network using BACnet or Modbus protocols to connect to an PLC or their building’s IP network.

Enless Wireless also manufactures ranges of Sigfox and LoRaWAN® devices which allow system integrators to build operated networks. Effective monitoring of the energy consumption, CO2, VOC, temperature … with Low-Power / Ultra Long-Range products that are quick and easy to install is the first step to guarantee the safety and comfort of building’s occupants … and the optimization of the energy bill!

For more information, visit

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