What does the Air Quality Indicator show and how does it work?

The Air Quality Indicator is available only in HPA5200, HPA5250, HPA5300, and HPA5350 Series models and displays air quality based on VOC levels: Green indicates good air quality with low VOCs, Yellow indicates moderate air quality with moderate VOCs, and Red indicates poor air quality with elevated VOCs. Upon startup, the indicator may pulse between colors for a few minutes while calibrating, then remain solid once air quality is determined. (Page 6)