Finding F-0451

“There was a significant occupancy status main effect, with occupied spaces having higher average log CO2 (603 ppm) than unoccupied spaces (423 ppm), regardless of building zone (p < 0.001).”

Erlandson et al. Characterization of Indoor Air Quality on a College Campus: A Pilot Study (2019). International journal of environmental research and public health. Page 8. CKB 7553

Structure

Factor: Carbon dioxide (CO₂)
Population: university students and staff
Setting: campus building zones, unoccupied, US
Study design: pilot study on a college campus in Colorado: multi-zonal 48-hour measurements of particulate matter, formaldehyde, CO2 and nitrogen oxides in a LEED-certified, a retrofitted and a conventional building, occupied and unoccupied, mixed-effects models on log-transformed concentrations (class 4)
Effect: mean 423
Averaging time: 48-hour sampling periods
Caveat: printed as an average of log CO2 back-transformed to ppm

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.