35 healthy Shanghai college students used a purifier for 48 hours. Here’s what happened to their bodies

There are two things we know about purifiers and one really important thing we don’t know.   1. We know that purifiers reduce PM2.5   Loads of tests have found this in labs and in real-world homes. I’ve tested the hell out of this, in my room, in bigger rooms, for 200 days of Beijing air, comparison tests against the […]

Read More