New Tests! Can a 450 RMB DIY remove as much particulate as a $1,000 IQ Air?

When the “airpocalypse” struck Beijing, I got out my credit card to give $1,000 to IQ Air. But the price just didn’t seem right, and I soon learned that HEPA filters are what capture particulates (even in the expensive machines), and they were invented way back in the 1940s. So I made my own and started doing […]

Read More