After I tested every fan in China I could find with a flat front… …the results of one fan stood out above the rest. Because of its appearance and how much butt it kicked, I called it “the Cannon.” In Anna’s 15m2 Beijing bedroom, it crushed particulates. It removed 97% of the small .5 microns […]
Tag: PM 0.5
Test: Do you have to run your purifier all day?
Some purifier companies recommend running your purifier all day. But is that really necessary? If so, isn’t that a big waste of your filters and energy? Method To get to the bottom of it, I set a Smart Air Cannon on a timer to turn on for two hours everyday in a 13.5m2 Beijing bedroom: […]
Does Chinese New Year Affect Inside Air?
I’ve posted data before showing that outdoor air quality is strongly correlated with indoor particle counts (r = .71), but Chinese New Year gives nerds like me a great chance to see what happens when we get a momentary shock to air quality. The media made a big deal about people cutting back on fireworks this year […]
The Really Small Stuff
To test how effective the DIY filter is, I’ve been posting lots of data on 2.5 micron particles. But my particle counter also measures smaller 0.5 micron particles, and I’ve been looking closely at that lately. Remember that the “PM 2.5” you hear in the news is different from the numbers on most particle counters. Laser […]
How Safe is Indoor Air?
I recently had a conversation in Beijing that went something like this: Friend: I’m not sure if I can make badminton tomorrow. I have a basketball game in the day. Me: Oh man, do you play outside? Friend: Nah, it’s inside. Me: Oh, phew. Good. Friend: Wait, why do you say that? Me: Oh, the air […]