The smog is frequently attacked, which plagues people's lives and affects their health. Therefore, masks are very popular. However, in the complicated choices, especially the most popular 3m masks, how to find the one that can really prevent smog? Let me introduce the 3m mask anti-fog.
    Many masks are resistant to PM2.5, but there are two types of dust, oily and non-oily. Ordinary PM2.5 masks can only be non-oily and have no protection against oily PM2.5 particles mainly formed by automobile exhaust.
    Therefore, in order to judge which kind of 3m mask anti-fog, we must first understand what the meaning of N and R, P, etc. in the mask. N in the mask represents non-oily particles, while R and P represent oily particles. Non-oily particulate matter includes coal dust, cement dust, acid mist, welding fumes, microorganisms, etc.; oily particulate matter includes oil mist, soot, coke oven smoke, and the like. Each model is further divided into three filter performance levels, 95%, 99% and 100% respectively. N95 means “dust mask with 95% non-oily particle efficiencyâ€. â€
    Therefore, we can draw conclusions:
N95, N99, N100 can filter out at least 95%, 99%, 99.97% of suspended particulate matter, not resistant to oil;
R95, R99, R100 can filter out at least 95%, 99%, 99.97% of suspended particulates, a little oil resistant;
P95, P99, P100 can filter out at least 95%, 99%, 99.97% of suspended particulate matter, quite ~ oil resistant;
That is to say, the actual meaning of "N95" is: at least 95% of suspended particulate matter in the air can be filtered out, but the filter grade is not resistant to grease.
    At present, it is believed that the particulate matter most threatening to human health in the atmosphere is inhalable particulate matter (PM10) with a diameter of less than 10 microns, especially the accessible lung particulate matter (PM2.5) having a diameter of 2.5 microns or less. For these tiny particles, the filtration effect of N95 is worthy of recognition. In the production standard of N95, the test sample as a particulate matter is a sodium chloride aerosol having a diameter of 0.1-0.5 micrometer, and the qualified N95 mask should have a filtration rate of more than 95% for this aerosol. Therefore, if the N95 or higher-level dust mask is properly worn, even if the Air Quality Index (AQI) reports heavy pollution, we can feel a little more comfortable when we go out. â€
    Therefore, in general, the general cockroaches contain both non-oily granules and oily granules (oily granules in automobile exhaust). If you want to be economical, you can use the 3m N95 mask.
    The above is a good introduction to the 3m mask anti-fog, I hope that you can help in choosing a mask.
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