Devices and methods of inhibiting the inhalation of particulates using a resiliently deformable filter packaged in a sealed envelope containing a liquid medium. The method includes opening the sealed package to thereby expose the filter to ambient air； removing the filter from the package； inserting the filter into a distal region of a nostril； and urging the filter from the distal region to a proximal region of the nostril while simultaneously swabbing the distal region with the liquid disinfectant. The filter includes: an initial stage characterized by a first pore size； an intermediate stage characterized by a second pore size； and a final stage characterized by a third pore size, wherein the third pore size is a smaller than the first and second pore sizes.
