The circulating LED lighting indicates the level of pollution in the air, which is measured via the PM2.5 sensor. In automatic mode, the fan level 1-8 regulates itself up and down based on this measurement. The air pollution level is indicated in the range 0-500, which corresponds to the particle load in ug/m3 at a ratio of 1:4.
0-79: very good or good
(There is little or no health risk).
(Air quality is acceptable, there is a health risk only for a few very sensitive people).
(There is a health risk for all persons sensitive to air pollution).
160-500: very poor
(Air quality is potentially hazardous to the health of all persons).