Finding F-1444

“The CO2 concentration limit was never reached, with average CO2 concentrations of 694 PPM and 753 PPM recorded in classroom C3B and C3D, respectively.”

Ferrari Air change rates and infection risk in school environments: Monitoring naturally ventilated classrooms in a northern Italian urban context (2023). Heliyon. Page 13. CKB 5700

Structure

Factor: Carbon dioxide (CO₂)
Setting: classroom
Study design: measurement of air change rates and carbon dioxide in school classrooms under several ventilation strategies, with the infection risk modelled from the measured air change rates (class 3)
Effect: mean 694
Caveat: the peaks of the same classrooms reach slightly above 1000 ppm; the infection risk of the study is modelled and is not taken

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.