CO₂ can help identify insufficient ventilation in an occupied bedroom. It does not measure every pollutant or represent complete indoor air quality.
What is measured
People exhale CO₂, so its time profile relates to occupancy and ventilation. Record occupants, doors, windows and ventilation mode alongside readings.
Sensor and placement
Check sensor type, calibration and instructions. Placement beside a face, open window or supply outlet can produce unrepresentative readings.
Time series
One snapshot cannot describe a night. Compare several typical nights under known conditions and check whether supply reaches the bedroom with doors closed.
What the reading cannot prove
Low CO₂ does not establish absence of particles, volatile compounds or radon. HSE treats it as a broad ventilation indicator; UK workplace guidance is not automatically a Ukrainian bedroom requirement.
Actions and mistakes
Check filters, balancing and transfer paths before changing equipment. Do not make medical conclusions from a domestic sensor or disable required ventilation because of one doubtful reading.
| Item | Parameter | Check / result |
|---|---|---|
| Sensor | Type and calibration | Reliability |
| Log | Night and occupancy | Context |
| System | Supply and transfer | Balance |
What this means for your project
Collect readings with room operating conditions and review ventilation accordingly. Other pollutants need their own assessment methods.
Sources and scope of review
Related reading
- Ventilation Rates: How Much Air Does a Home Need?
- Winter Humidity in Homes with MVHR
- Radon and Foundation Sealing: What to Consider