What do the VOC sensor indicator light colors mean?
A green light means a low level of VOCs is detected and the unit will operate at the Germ setting; amber means a moderate level and the unit will operate at General Clean; red means a high level and the unit will operate at the Allergen setting. The air purifier continuously monitors VOC levels and adjusts the cleaning level automatically. (Page 5)
From the official Honeywell HPA8350 Air Purifier manual, page 5
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