In What Way Can You Quickly Know The Filtration Efficiency Of A Mask in Your Daily Life?

In everyday life, if you want to get a quick idea of the filtration efficiency of a mask, you can add a cigarette butt to the cup and cover the north mouth with a mask. Check to see if there is smoke above the mask. If there is smoke, it indicates that the mask is not efficient in filtering. If not, it indicates that the mask is effective in filtering. Very high. That's the way it goes fast.