Finding F-0442

“It can be observed that CO2 concentration rises after the students enter the classroom to reach a peak of 3505 ppm in approximately three hours until a recovery time with a door opening and windows in which there is a descent of CO2 levels to 1000 ppm.”

Sánchez-Fernández et al. Evaluation of Different Natural Ventilation Strategies by Monitoring the Indoor Air Quality Using CO2 Sensors (2023). International journal of environmental research and public health. Page 7. CKB 5690

Structure

Factor: Carbon dioxide (CO₂)
Intervention: Natural ventilation
Population: school pupils
Setting: classroom, ES
Study design: CO2 monitoring in classrooms of eight educational centres in Valencia (Spain) in 2019 under real conditions, with occupancy, activity, ventilation strategy and break duration recorded, to derive natural ventilation guidance (class 4)
Effect: other 3505
Averaging time: peak after about three hours of occupancy
Caveat: peak recorded as measure other; the sentence describes one classroom's time series shown in a figure

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.