KenKogei

It's tea dust. Produced during the processing of black tea.

Am seeking the relationship indicating how many millions of particles of 0.5um, 2.5um or 5.0um per unit volume will make a milligram of respirable dust per unit volume. There has to be something somewhere. Keeping in mind that this is organic dust.

I recently carried out dust analysis by use of a laser dust counter. The results were in um/m3. I am seeking to convert the values to ppm or mg/m3. e.g. a result of 2028478 particles of 5.0um/m3 to be converted to mg/m3.