A relatively high measurement of pollution surrounding or near an individual organism that arises when the individual's movements stir up gases and particles on their clothes or nearby surfaces. The concentrations of personal clouds can range from 3-67 microgram/m3 for PM10, or 6-27 microgram/m3 for PM2.5. [Environmental Science and Technology; v33; 3645-52; 1999.] [Environmental Science and Technology; v34; 64A-65A; 2000.]