People often judge an indoor space by how it feels: too warm, too cold, humid or stuffy. But comfort alone does not explain how well the space is being ventilated. In occupied offices, meeting rooms, classrooms, clinics and public buildings, measuring carbon dioxide, temperature and relative humidity gives facility managers a clearer picture of the indoor environment.
These measurements do not replace a comprehensive environmental or health assessment. They provide practical evidence that can help teams recognise patterns, investigate complaints and make better decisions about ventilation and occupancy.
What does carbon dioxide tell us?
People exhale carbon dioxide as they breathe. In an occupied room, the CO₂ concentration can rise when fresh-air exchange is insufficient for the number of people present. A monitor therefore provides a useful indication of ventilation performance over time.
A single high reading should be interpreted in context. The number of occupants, room volume, time of day, outdoor conditions and ventilation system all affect the result. Trend data is often more useful than an isolated measurement because it shows when concentrations rise, how quickly they recover and whether the same pattern repeats.
Temperature and humidity complete the picture
Temperature affects comfort and can influence concentration and productivity. Relative humidity also matters: persistently high humidity may encourage condensation and mould, while very dry air can cause discomfort.
Monitoring the three parameters together helps a facilities team answer practical questions:
- Does air quality deteriorate during busy meetings or lessons?
- Are some rooms consistently warmer or more humid than others?
- Does opening a window or adjusting mechanical ventilation improve conditions?
- Do readings return to normal after occupants leave?
- Is the problem occasional, seasonal or persistent?
A simple monitoring approach
Place the instrument in the occupied zone, away from open windows, doors, direct sunlight and a person’s immediate breathing stream. Allow the reading to stabilise, then record conditions across normal periods of use. For a useful comparison, note the time, occupancy and any changes to ventilation.
The Chauvin Arnoux CA1510 indoor air-quality monitor measures and records CO₂, temperature and humidity simultaneously. It can store up to one million measurements and provides visual and audible alerts. Its portable and fixed-use options make it suitable for offices, meeting rooms, classrooms, hospitals, factories, public transport and residences.
Because the CA1510 records measurements over time, users can move beyond impressions such as “the room becomes stuffy” and identify precisely when conditions change. Recorded data can also support reporting and discussions with building managers, ventilation specialists or occupational-safety teams.
From measurement to action
Measurement is the beginning of the process, not the end. Depending on the building, improvement may involve reviewing occupancy, opening available ventilation paths, maintaining air-handling equipment, adjusting operating schedules or obtaining advice from a qualified HVAC or indoor-environment specialist.
It is also important to distinguish CO₂ from other indoor pollutants. A CO₂ monitor does not directly measure particulate matter, volatile organic compounds, carbon monoxide or biological contaminants. Where those hazards may be present, a broader assessment and appropriate specialist instruments are required.
Chauvin Arnoux Africa provides environmental measurement and data-logging solutions for professional users across Ghana and West Africa. To discuss a monitoring requirement for a school, workplace or public facility, request a quotation or technical recommendation.