First of all, PM10 should include PM2.5, so it should be greater than or equal to PM2.5 value.
When both PM2.5 and PM10 are relatively low, it is normal to see similar reads.
To check whether the sensor works well, you may turn on an atomization humidifier or light a cigarette next to the QP Lite, and compare the changes of PM10 and PM2.5. The cigarette will increase both PM10 and PM2.5 levels but to a different extent, while humidifier will only increase PM10 level.
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