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I would like to ask about origin and inventor of particulate matter pm10, pm2.5.

Who published and defined this formulas and when.

Thanks in advance!

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    $\begingroup$ You question is lacking detail & I suspect there may be a language translation issue. When you ask who invented pm 10 & pm 2.5 do you mean actually invented or who first had the idea for classifying particulate matter by size & used 2.4 micron & 10 microns as sizes of such matter? Also, what formulas are you referring to? $\endgroup$ – Fred Dec 11 '19 at 17:16
  • $\begingroup$ Welcome to EarthScience.SE. Do you mean the origin of the particles in the atmosphere or do you mean the classification of PM10/PM2.5 (Why PM10 and not PM5?)? In the latter case, this question seems to be a duplicate of Which particles are classified as PM2.5? How exactly is this defined?. In the first case, the text in the linked question might answer your question. $\endgroup$ – daniel.neumann Dec 12 '19 at 8:43