than ever. our best bet, an n95 mask. >> if you are going to wear a mask wear the best mask possible. >> aaron collins a self-proclaimed mask nerd is a mechanical engineer with a background in aerosol science. >> there is significant improvement in the amount of aerosol that you're going to be exposed to when everyone is wearing an n95 and you're wearing an n95. >> i think it's worth reminding people why exactly they work so well. it has to do with the actual material. there are electro static clee charged fibers in here so it's not just gufiltering particles it's attracting particles. also it works well not just for air that's potentially coming in but also for air that's potentially going out. now, one key they think about the n95 masks is you've got to make sure they actually fit really well. having these two bands around the back of your head annual