Edit (Feb. 1, 2020): With the coronavirus outbreak in China, this post is getting a lot of hits from Vietnam. First and foremost, PM2.5 masks (actually called respirators) are not a replacement for surgical masks. See this video to learn how to wear a surgical mask -> https://www.youtube.com/watch?v=CWrinkuoljE. --- I decided to do a post on all of the different PM 2.5 … [Read more...] about PM 2.5 masks I wear in Saigon (HCMC), Vietnam