Can kn95 masks prevent smog?
In fact, PM2.5 is fine particulate matter, also known as fine particles or fine particles. Fine particulate matter refers to particulate matter with an aerodynamic equivalent diameter of 2.5 microns or less in ambient air. It can be suspended in the air for a longer time, and the higher its concentration in the air, the more serious the air pollution.
Kn95 is not a brand, but a standard, which means that the filter material in the mask can protect against non-oily particles with a filtration efficiency of 95%. According to the national standard, KN90 is the most basic level, and KN90 masks are sufficient for ordinary people. Therefore, kn95 masks can prevent smog to a certain extent.