Finding F-0338

“Outdoor HCHO (UTS IAQ 9) remains low (mean ~1.1 ppb, max 4.2 ppb), so the hotspot is not driven by outdoor air but by local indoor sources.”

Arezoo et al. Indoor and Outdoor Air Quality Monitoring in a Sydney Medical Research Center Using IoT and Toxicological Assessment (2026). Page 3. CKB 1064

Structure

Factor: Formaldehyde (CH₂O)
Method: Low-cost sensors
Setting: outdoors at the building, AU
Study design: IoT sensor monitoring (10 low-cost sensor nodes, one outdoors) of PM, CO2 and formaldehyde in a medical research centre in Sydney, with toxicological assessment of collected particles (class 4)
Effect: mean 1.1
Caveat: low-cost sensor readings; printed as ~1.1 ppb

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.