What does PM 2.5 mean? The 2.5 in PM 2.5 refers to the size of the pollutant, in micrometers. The tinniest thing which the human eye can see is at least 0.1 millimeters, about the width of a strand of fine air (70 micrometers). For you to see something as small as a micrometer, you need to use microscopes.
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