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@allObjects
...does it not matter what matter the dust particles are of?
Specific weight, size, and count would go into that formula. I'm not aware of an average value for the specific weight. It does not look like that there is a simple formula to convert from count per volume to weight per volume. All references I found use a very complex and highly sophisticated anlysis of test/calibration samples taken in a very defined context to determine the weight(s). Count profiles of samples taken in comparable context are then mapped against the count profiles and related weight(s) of the test/calibration samples to 'estimate' the weight per volume concentration.