When a billion people in China (and quite a few expats) woke up to the severe air pollution in almost every city in China, it forced a billion people to become experts in a complicated scientific question. Do pollution masks work? Since then, I’ve given talks with hundreds of people all around China about how […]
Tag: mask
Poor Man’s Fit Test
Which mask works best on your face? I was fortunate enough to visit a lab to do a super fancy fit test, but very few of us have access to this $10,000 machine. So what should normal folks do? While visiting the 3M lab, I learned about what I’m calling the poor man’s fit test. […]