Finding · as stated by the study, recorded by Coridum · status verified-machine

Finding F-1204

“During night-time occupancy, CO2 concentrations in both bedrooms frequently exceeded recommended limits, reaching values between 1200 and 1500 ppm, while the living room remained below 900 ppm due to regular daily ventilation practices of approximately 3 h.”

Influence of Natural Ventilation on Indoor Air Quality in a Sin- gle-Family Dwelling in the Northwest Area of Madrid (2026). Page 12. CKB 1085

Structure

Factor
Carbon dioxide (CO₂)
Setting
home (bedroom) (night-time occupancy)
Study design
measurement study in a single-family dwelling in the Mediterranean climate: carbon dioxide, particles and thermal parameters logged in the hall, two bedrooms and the living room with outdoor air for comparison, against the ventilation habits of the occupants (class 4)
Effect
other 1500
Caveat
the sentence gives a range; the upper end is the estimate and the whole range sits in dispersion

A Finding records what one published document states, verbatim and with its page. It is not a conclusion of Coridum; see the Claims that build on it.