I never understood why I bought it. Shows 001 - 004 (maximum), respectively, works at minimum speed on the machine. Peter, the center, next to the avenue (4 lanes in each direction), embankment, constant traffic jams. A robot vacuum cleaner collects a full container of dust in a week. But I have mountain air in my apartment. The sensor seems to be working, it reacts to cigarette smoke. Bought one for my parents. Hong Kong, a couple of times scaled in the red zone, consistently shows about 20. The conclusion is simple - measure the level of PM 2.5 in the apartment before buying this box.
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