Current particulate air pollution is a major problem into the larger community. The dust in the atmosphere around us, with sizes ranging from 0.002 microns, which is a group of molecules. (To the naked eye can not see. Electron microscopy requires a) to larger than 500 microns, a large sand visible to the naked eye. (Dust is visible with the naked eye, ranging in size from 50 microns and above) dust, a substance with a variety of physical and components. There may be a solid, liquid or dust. Suspended in the air longer. Often the smallest dust particles. (Which has a diameter less than 10 microns) due to the low speed of the fall. If there are external forces involved, such as the flow of air currents, etc., will be suspended in the air longer. The large dust (Diameter becomes larger than 100 microns) suspended in the atmosphere may be only 2-3 minutes, but dust that is smaller than 0.5 microns may hang in the air for as long as a year.
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