Poor air during sleep – measurements in the bedroom

\nMeasurements of carbon dioxide concentration at night were conducted in the bedroom of an insulated house. The bedroom had an area of 45 m² and was equipped with new plastic windows. Two adults and a one-year-old child slept in it. The sensor recorded an increase in concentration of CO₂ to more than three times the recommended value. “Over 3,000 ppm of carbon dioxide was measured in the air, which is far beyond the threshold for a quality sleeping environment,” says Ing. Miloš Žáček, executive director and managing director of Protronix.
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Graph No. 1: Measured values with completely closed windows

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\nThe following night, measurements were conducted with the same number of people, but with micro-ventilation, enabled by the less tight installed windows. The maximum measured values of CO₂ were lower (2600 ppm) and from one o’clock in the morning, the concentration dropped significantly, reaching the recommended level by morning.
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Graph No. 2: Measured values with micro-ventilation

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\nThe third measurement was conducted with the window tilted open. The concentration level of carbon dioxide exceeded slightly above 1200 ppm at its highest point. The measured concentration level corresponded to a ventilation ratio of about 23 m³ of air per hour per person, which meets the generally accepted requirement for fresh air in a room.
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Graph No. 3: Measured values with the window tilted open

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