Finding F-0304

“Without the device, the mean HCHO concentration was 0.453 mg/m3 , the highest was 0.622 mg/m3 , the lowest was 0.261 mg/m3 .”

Ilieș et al. The Home-Based Rehabilitation of Patients Through Physical Exercises in the Context of Indoor Air Quality (2025). Healthcare (Basel). Page 10. CKB 1369

Structure

Factor: Formaldehyde (CH₂O)
Intervention: Air purifiers
Setting: home, RO (18 weeks)
Study design: 18-week monitoring of 11 indoor air quality parameters with low-cost equipment in a home room used for rehabilitation exercises in Oradea (Romania), with and without an air purifier (class 4)
Effect: mean 0.453
Caveat: measured with low-cost equipment; formaldehyde readings of 0.2 to 0.6 mg/m3 are far above typical indoor levels and rest on that equipment

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.