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

Finding F-1446

“However, when outdoor PM2.5 concentrations exceeded 50 μg/m3, buildings ACH with 10−15 exhibited elevated indoor PM2.5 levels, ranging from 22 to 60 μg/m3.”

Impact of Wildfire Smoke PM2.5 on Indoor Air Quality of Public Buildings on a University… (2025). ACS EST Air. Page 8. CKB 1142

Structure

Factor
Particulate matter (PM₂.₅ and PM₁₀)
Study design
study of wildfire smoke and indoor air quality in eleven buildings: indoor and outdoor fine particulate matter measured together with the air change rate of each building, split by outdoor concentrations below and above 50 μg/m3 (class 4)
Effect
mean 60
Caveat
eleven buildings during wildfire smoke episodes

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.