m0useanswered grow question 2 months ago pollen is around 10-100 microns in size, so unless that frost barrier can stop a 10micron particle its likely not going to be very efficient..
Plus lots of things carry pollen on them, pests, bugs, wind, humans.
Outdoors is an endless battle, best to hope for the best. as a frost shield sure. as a pollen prenaive, no.