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Jun 05, 2018 · the manufacture and distribution of chemicals; forrest fires; Why is it called 2.5? The 2.5 in PM2.5 refers to the size of the pollutant in micrometers. Bear with us here while it gets a bit mathematics-y! Micrometers have this symbol:µm and are equivalent to 0.001 millimeters.
Nov 27, 2015 · Dust particles are the main source of PM10. PM2.5 is comparatively much smaller in size as compared to other particles and pollutants. Meanwhile, PM 2.5 is particulates that have a diameter of 2.5 micrometers or smaller. These particles are so small that they can only be viewed under a microscope. Therefore, their small size makes them much
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