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The smallest particle visible to the naked eye is 40 microns. To give you some perspective, a piece of hair's width can range from 40 to 120 microns.
The smallest insects are fairy flies, which are insects that parasitize other insects' eggs by laying their eggs inside them. Fairy flies are only 1/5 of a millimeter in length. Many beetles are less than one millimetre in length, and the North American Feather-winged Beetle Nanosella fungi, at 0.25mm, is a serious contender for the title of smallest insect in the world.