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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.
Mold reproduces by way of spores, which are microscopic in size. Mold spores are measured in units called Microns. Generally, one of the smallest things someone with 20/20 vision can see is a raindrop, which is approximately 600 microns. Most mold spores range in size from 5-30 microns making them impossible to see with the human eye and easily moved through the air from even the smallest force.