I have a TP09, and I've been using the fan but the line graph for the air quality basically never moves. It's essentially a flat line in the green area just below the yellow area. To try to test it I tried spraying some Febreeze in front of it but it made no bump on the graph at all. I also tried smacking a chair to release some dust clouds in the air but nothing changed either. It also shows the PM2.5 and PM10 level both either at 1 or 2 which seems good but it seems too good, when the outside was around 10 and 40 respectively. Does this seem like it's working properly or is the sensor faulty?
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