Cleaning the Particles Sensor
PM1.0 (ultra-fine particles) sensor detects fine particles as well as coarse particles. Therefore, you need to clean its lens regularly.
Separate the rear cover of the product.
Open the sensor cover.
Clean the lens with a cotton swab soaked with water and clean it again with a dry cotton swab.
Note
Do not wipe the sensor with any substances other than water. It may cause a appliance to malfunction.