I’ve always wondered: how much does outdoor air pollution affect the air in my home? Even if I keep my windows closed, if the air outside gets really polluted, does air in my home get a lot worse? To answer that question, my Smart Air collaborator Anna has been taking particle counts in her Beijing […]
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 […]
My collaborator Gus Tate suggested we work with our HEPA manufacturer to get smaller, square HEPAs. Now we’re convinced the DIY filter just got a lot cuter: Cute and kicks PM 2.5 in the pants.
A while back, I posted data comparing how effective the DIY purifier was compared to a 6,000 RMB Blue Air and 11,000 RMB IQ Air. In that test, I calculated effectiveness as percent difference from outside air. At the time, I said I didn’t like that way of calculating effectiveness, but I did it that way […]
tmthyliu 提问: Just built a DIY air filter, pretty excited to have clean air in the house! I was wondering though, how does this work when the air conditioner is on? Does it make a difference at all? I don’t know how ACs work but it seems they pump more air into my room (where […]
My particle counter is a beast–I’ve loved it. But I’ve always wondered how the counts of laser particle counters like mine: …compare to the measurements of the huge stationary air quality monitoring stations that governments use, like this one in New Zealand: If you look at the US Embassy’s Twitter feed, you’ll notice that its […]