Why does the formaldehyde value displayed on the Mijia Smart Air Purifier Max increase at night?
It is normal for the formaldehyde value displayed on the Mijia Smart Air Purifier Max to increase at night. Many indoor materials, such as furniture, flooring, and building materials, naturally contain formaldehyde, which is continuously and slowly released into the air over time. During sleep, the air purifier can operate in a sleep mode or be turned off, which can reduce or temporarily stop the rate of air purification.
Since formaldehyde continues to be emitted, its concentration can gradually accumulate, causing the readings on the device to rise. This effect is particularly noticeable in closed rooms with limited airflow, where formaldehyde release can occur more quickly.
This behavior does not indicate a malfunction of the air purifier. It reflects the natural release of formaldehyde and highlights the importance of maintaining ventilation and continuous air purification to ensure a healthier indoor environment.
Does it help?
Yes
No