The goal of an allergist is to help you manage your allergies so that they do not interfere with the enjoyment of life. Nose Filters are temporary helpers while you are managing airborne allergies. Our knowledge of particulate pollution, prompted our development of a handy new product. It is Athma-Pure Nosefilters, a means of breathing clean air. Our Athma-Pure filters (charcoal free) are MERV rated to filter and adsorb particulates from 0.35 to 500 microns. The fractional efficiency is minimum when the particle size is small at 0.35 micron. This filter media construction, coupled with a proprietary electrostatic treating technology, allows filters made with Unique Media to achieve high initial and sustainable filtration efficiencies. You can buy this nasal filters at http://amzn.to/zr51P