Finding F-0337

“The temporal plots show that one of the indoor sensors on level 2 (located in front of the kitchen on a desk) experienced sustained periods with HCHO levels well above other indoor sensors, and the exceedance analysis indicates that its concentrations surpassed the California Reference Exposure Level (REL) of 9 ppb for about 75.5% of the time and exceeded the ASHRAE chronic guideline of 20 ppb for 1.1% of the time, while all other indoor sensors remained below both thresholds.”

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: office and laboratory 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: share-above 75.5
Caveat: low-cost sensor readings

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.