logoalt Hacker News

Jiahanglast Wednesday at 6:52 AM1 replyview on HN

After experiencing the COVID-19 pandemic, I have developed the habit of wearing a mask.


Replies

rudolftheonelast Wednesday at 9:39 AM

Yeah... The thing is surgical or cloth masks don’t do much against PM2.5. For actual pollution, you’d need a well-fitted N95 — anything less is mostly placebo with ear loops.