How many microns in a speck of pollen?

"Pollen grains come in a wide variety of shapes, sizes, and surface markings characteristic of the species... ...Most, but certainly not all, are spherical. Pollen grains of pines, firs, and spruces are winged. The smallest pollen grain, that of the Forget-me-not (Myosotis spp.), is around 6 µm (0.006 mm) in diameter."





So the smallest is 6 microns.