PM2.5 is a particle size. there's a second number that measures the percent of blockage of particles that size, something like merv-12, hepa, or n95, etc. I'm curious if you know that percent blockage number for what you use. for medical use we've been stacking merv 12 and merv 13 filters. Very effective. If we get them fitted right, we think they are better than N95.
but it makes something like a gas mask sized device in front of your face thats unwieldy. And there is downtime for cleaning and filter replacement. for the cloth filters were playing with merv 8 and merv 12 filters, in a cloth pouch. the breathability has been the issue. its a lot more safe if we use the higher level blocking filters, but were worried that the people that need it most, the elderly will take them off because its constricting their breathing. We can adapt, but we dont really have time to market test. the peak here comes next week. In some ways we are already too late.