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How can PM2,5 exceed PM10?

Hi, I wondered how it’s possible that on your site, given a certain location, PM2,5 is usually a lot more than PM10. This surprises me, since PM2,5 is particles with a diameter smaller than 2,5 micron, and PM10 is particles smaller than 10 micron. Everything that’s smaller than 2,5 micron is also smaller than 10 micron, so one would think that the value for PM2,5 can never exceed the value for PM10. Can anyone explain this to me?

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