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You need to watch Dr John Campbell's videos on YouTube to understand the benefits. This Dr is posting daily updates on the progress of the virus from around the world and has much very sensible advice for viewers

FFP3 or P3 is what you need. Pm2.5 /N95 equates to FFP2 /P2, a lower degree of filtering ability. Sellers on eBay have a lot on sale but beware the price gougers - watch items first to see how bids are going before deciding. Surgical masks are very available, but bear in mind they are not P3 or...