Selfish bastards wearing selfish masks! /sarcasm/whatever (as people tend to think I'm being apologetic towards shit...)
https://news.rthk.hk/rthk/en/compone...3-20211122.htm"What's special about these valve masks, is that they are masks that are a bit selfish. In other words, it filters what a person breathes in, but when you breathe out through this valve, it doesn't filter well," he told reporters.
The expert said he's advised airport and quarantine hotel staff to ask inbound travellers wearing a valve mask to change into a surgical mask.