"Mold spores" refers to tiny reproductive particles produced by mold. These microscopic particles are released into the air, and if they land on a surface with moisture, they can grow into mold. Full definition
I live in Iowa and our freak snow this spring caused a big outbreak of mold spores on top of the traditional pollen / grasses / everything blooming at once and irritating the heck out of skin and eyes. (4-legger.com)
looked at reviews and sure enough my product also contains mold spores in the whole package... i can not believe garden of life would produce such a product.. (amazon.com)
You should replace these to prevent mold spores from spreading in the future. (wikihow.com)