What do the colors on the Air Quality Indicator mean?
Green indicates good air quality with a low level of VOCs detected, yellow indicates moderate air quality with a moderate level of VOCs, and red indicates poor air quality with an elevated level of VOCs detected. This feature is only available on the HPA5200, HPA5250, HPA5300, and HPA5350 Series models. (Page 6)
From the official Honeywell Hpa5100 Air Purifier manual, page 6
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