Medical masks are highly hydrophobic and breathable, and have an obvious filtering effect on tiny toxic aerosols or harmful dust. Generally, the filtering effect is good, the materials used are non-toxic, harmless and easy to use. However, the filtration efficiency requirements of the ordinary medical masks we buy for particles and bacteria are lower than that of medical surgical masks and medical protective masks, which means that the filtration efficiency is less than 30. And it has a certain degree of filtering effect on PM2.5 and other particles. If you want a better filter effect, you can buy a style with more layers.
N95 mask is the best protection against PM2.5 on the market. The filtration efficiency of non-oily particles such as dust, paint mist, acid mist and viruses can reach 95 or more.