This is related to the detection mechanism of the PM2.5 sensor. The breath that a person blows contains a part of water vapor, which will be mistaken for the sensor as dust particles, which affects the detected value; on the other hand, it is related to the change of the sensor’s air intake. , The air intake becomes larger, which in turn leads to an increase in the concentration of particulate matter passing through the unit concentration, and then the test result rises!
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