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Why (and how) is particulate matter measured in mass per volume?

Why are particulate matter measurements (like PM2.5) from an air quality monitor given in micrograms per cubic meter (μg / mm^3)? The fundamental measurement for particulate matter is done using a ...
f.thorpe's user avatar
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Why (and how) is particulate matter measured in mass per volume?

Your post has multiple questions. Here are a few comments. If the device does indeed count particles, how does it convert that to mass? Conversion from particles per volume (a number density $\rho_N$...
Jeffrey J Weimer's user avatar

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