If that happens, there’s been some error. PM10 is the weight/mass of particles 10 microns and under. PM2.5 is the weight and mass of particles 2.5 microns and under. That means PM10 includes PM2.5.
Click here to read the original answer on Quora: https://www.quora.com/What-if-the-concentration-of-PM2-5-is-higher-than-the-concentration-of-PM10-for-the-same-location
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