Finding F-0453

“Average CO2 levels were highest in classrooms (513 ppm), common areas demonstrated the second highest concentrations (498 ppm), and outdoor areas had the lowest levels (425 ppm) among test zones within buildings, although there was no significant zone main effect.”

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: common areas of campus buildings, 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 498
Averaging time: 48-hour sampling periods

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.