Are air purifiers useful to fight the 'new coronavirus'?

Presumably many people are worried about the 'new crown virus'. When they see everyone wearing masks, they will see such a question mark when they see the air purifier in their living room. In order to answer this question, we must first understand why we wear masks and why masks are useful for the 'new coronavirus'. Whether it is N95, N90, or the national standard KN series, South Korea's KF series, these masks can effectively prevent the virus from invading our respiratory tract. N95 means that the filtration 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 the front line of epidemic prevention. For us who just go out to take out the garbage, medical disposable masks are completely sufficient. So are air purifiers useful? The answer is useful. If you admit that masks are useful, it's hard to deny that air purifiers are also useful. Because the principles of the two are basically the same, and the filtration efficiency of the air purifier is better. The core filters of air purifiers on the market are basically HEPA, which is not less than 99.97% for 0.3 micron particles, while the N95 just mentioned is 95%. Therefore, masks can filter out viruses, and air purifiers can of course do better. Most of the purifiers use HEPA filters, but it is not very strict to say that, because the two filters are not actually viruses, but vectors carrying viruses. Yes, for viruses to spread, they usually have to use a vector. Therefore, air purifiers are useful against 'new coronavirus'.
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