Is turning on the air purifier useful for preventing coronavirus infection?
In order to answer this question, we must first understand why we wear masks, and why masks are useful for “coronavirus”. Whether it is N95, N90, the national standard KN series, or the Korean KF series, these masks can effectively prevent the virus from invading our respiratory tract. N95 means that the filtering effect of 0.3-micron particles has reached 95%, and N90 is 90%. In fact, it is not us who need N95 or N90, but the medical workers on [...]