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Apr 06, 2020 Coarse particles have a diameter of between 10 µm and 2.5 µm and settle relatively quickly whereas fine (1 to 2.5 µm in diameter) and ultrafine (<1 µm in diameter) particles remain in suspension for longer. Keep in mind that due to how the scale is built, PM 10 (coarse) also automatically contains PM 2.5 (fine) and PM 1.0 (ultrafine).
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