I have a Dyson TP04. I have recently noticed that the PM level shown in the display increases when the fan speed is increased. For example, when the fan speed is at 1, the PM 2.5 displayed is around 25. But when I increase the fan speed to 10, the PM 2.5 is around 60-65. Using an external air quality monitor, I find the PM level to be around 40-45. What could be the reason? Any suggestions on how I can sort this out.
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