How can I determine the concentration of dust? Let's say it's for general forest residue chips (biofuel). Perhaps the question is vague, but I am not sure. I am still new to the site, so I am not sure if this is an appropriate tag, at least it's close to what I am working with. I have the most data I need, but I couldn't find a formula to calculate the dust concentration of a certain biofuel which would be acquired with the help of the data I have.
To measure the dust concentration, run a known amount of dust-laden air over an adequate dust filter. Measure the filter's weight at the start, $w_0$, and at the end, $w_1$, of the run. The volume run over the filter during the run is $V_N$ (converted to Normal volume).
The dust concentration is: