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Lab tests showed that even a microns-thick transparent layer of the new lotions effectively blocked UV light.—Andrew Paul, Popular Science, 4 Sep. 2025 Wildfire smoke falls under the category of pollutants known as PM2.5, which describes particles in the air smaller than 2.5 microns.—Andrew Montequin, jsonline.com, 2 Aug. 2025 Wildfire smoke is one of several sources of a type of air pollution called PM, fine particulate matter in which the particles are no larger than 2.5 microns wide.—Meghan Bartels, Scientific American, 1 Aug. 2025 The fine mesh filter takes care of larger particles, passing them through to the True HEPA to capture pollen, dust, smoke, and pet dander as small as 0.3 microns.—Cheryl Fenton, Parents, 19 July 2025 See All Example Sentences for micron
Word History
Etymology
New Latin, from Greek mikron, neuter of mikros small — more at micr-
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