Overview
To support its green building goals and enhance the guest experience, The Bauhinia Hotel Hong Kong has upgraded its indoor air quality management system. More than 40 Tongdy EM21 indoor air quality monitors have been installed throughout the property,providing the hotel with continuous visibility into conditions in key guest areas.
The system provides reliable environmental data for day-to-day operations while supporting the hotel’s broader sustainability and green building objectives.
Why Hotels Need Continuous Indoor Air Quality Monitoring
Hotels contain a wide range of spaces, including guest rooms, lobbies, corridors and shared facilities. Occupancy, ventilation and HVAC operation can vary significantly from one area to another.
A one-time air quality test only captures conditions at a particular moment. Fixed monitors, by comparison, collect data continuously. A network of monitors is therefore better suited to hotels and other multi-zone commercial buildings.
Continuous monitoring allows hotel management teams to assess:
Whether CO2 levels increase during busy periods
How PM2.5 concentrations vary between different areas
Whether TVOC levels show unusual changes
Whether temperature and humidity remain stable
How indoor conditions compare across floors and functional zones
A Multi-Zone Monitoring Network Built Around the EM21
The Bauhinia Hotel has deployed more than 40 EM21 monitors in areas that directly influence guest comfort and perception.
By combining multiple monitoring points with continuous data collection and zone-by-zone comparisons, the system provides a practical foundation for digital indoor environmental management.
Why the Hotel Chose the Tongdy EM21
Following a detailed product evaluation, the hotel selected the Tongdy EM21, a commercial-grade indoor air quality monitor developed by Tongdy Sensing. With more than 20 years of experience in air quality monitoring, Tongdy provides monitoring solutions designed for demanding commercial environments.
1. Discreet Integration with Interior Design
Hotels place a strong emphasis on maintaining a consistent interior design. The EM21 supports standard in-wall installation, allowing it to blend neatly into the surrounding space without drawing unnecessary attention.
The result is continuous air quality monitoring with minimal visual impact.
2. Multi-Parameter Environmental Monitoring
The EM21 combines several indoor environmental sensors in a single device:
Carbon dioxide (CO2): Industrial-grade NDIR sensing provides a useful indication of occupancy patterns and ventilation performance.
Particulate matter (PM2.5 and PM10): Continuous particle monitoring helps facility teams understand indoor pollution trends and assess filtration performance.
Total volatile organic compounds (TVOC): TVOC data supports the management of emissions associated with furnishings, renovation materials and cleaning products.
Temperature and humidity: Accurate real-time measurements help the hotel maintain comfortable indoor conditions.
Optional parameters: Formaldehyde, light level and noise monitoring are also available.
3. Support for Green Building Objectives
For properties focused on long-term sustainability, indoor environmental data plays an increasingly important role. The EM21 is designed to support air quality monitoring requirements associated with international green building frameworks, including RESET, WELL v2 and LEED v4.
This helps the hotel strengthen its environmental management practices, support ESG goals and protect the long-term value of the property.
From Air Quality Monitoring to Digital Hotel Management
The value of air quality monitoring goes beyond displaying measurements. Its real benefit comes when environmental data becomes part of everyday hotel operations.
Clear Information for Guests
A three-colour display or status indicator allows guests to understand the current air quality level at a glance. Making indoor conditions visible can provide reassurance and help build trust.
More Effective Facility Management
Through the EM21’s communication interfaces, data from each monitoring point can be transmitted to the hotel’s building management system (BMS) or a cloud-based platform.
Facility teams can use real-time and historical data to review ventilation performance, adjust fresh-air operation, and evaluate the results of system improvements. This data-driven approach can support healthier indoor conditions while reducing unnecessary energy use.
Flexible Data Collection
In addition to network-based data transmission, the EM21 includes an onboard data logger. Historical records can be downloaded locally via Bluetooth, giving hotels greater flexibility regardless of their existing network infrastructure or system configuration.
Conclusion
The collaboration between The Bauhinia Hotel Hong Kong and Tongdy has established a reliable foundation for continuous, multi-zone indoor air quality monitoring.
By tracking key parameters such as PM2.5, CO2, TVOC, temperature and humidity over time, the hotel can better understand how indoor conditions change across different spaces and operating periods. The resulting data supports facility management, ventilation control and ongoing improvements to the indoor environment.
This project also reflects a broader shift in hotel air quality management: from one-time testing to continuous monitoring, and from isolated measurements to coordinated, data-driven management across the entire property.
Related Information
Post time: Aug-12-2026