Thanks for your question.
According to relative researchers, the filter also works for those particles as small as 0.1 micron.
Unlike particles of 0.3 micron, the particles of 0.1 micron are almost in a free state so that the filter can do an absorptive action.
Besides, please be rest assured that the 4 types of filter are in H13 medical degree.
Hope this can help you.
