A few months after I published my DIY tests, there were already Taobao stores up and running, selling DIYs even cheaper than my 200 RMB. I was intrigued. If we could really lower the cost of clean air, that’s a win! But we have to be sure these cheaper machines are as effective. So I […]
Bill is an expat living in the hills northwest of Beijing, and he uses his DIY Cannon to cut the particulate in his home. But Bill wanted to improve on the biggest downside of the Cannon–it’s a bit loud on high: So Bill designed a sound dampening box for the Cannon out of foam blocks: There […]
Thomas held our first-ever DIY workshops in Ulaan Baatar, Mongolia on September 11-12th. UB residents will soon be breathing winter air pollution that is even worse than Beijing’s. Fortunately now more people are breathing clean air!
“Formaldehyde” (甲醛) is a surprisingly common word in China. I say surprising because I’m from the US, where only scientists and high schoolers dissecting frogs tend to be familiar with the chemical. But it’s not because Chinese people are all nerds. At dinner with Chinese colleagues, my friend David once used the word “carbohydrate” (碳水化合物) […]
When I published tests of the DIY compared to the expensive machines, a couple people on Zhihu (China’s Quora) asked if you really save money in the long run with the DIY once you calculate the cost of changing the HEPA. After all, the IQ Air HEPA costs 1,782 RMB, but you can use it […]
After I published directions for how to make your own purifier, people asked me: “Which HEPAs should I use? Is this one trustworthy?” That’s the type of question that makes a nerd like me happy because it means we need to get more data. So I ordered HEPAs from every manufacturer I could find, and I […]
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 […]
I wrote early on that my number one concern in China is particulate pollution. It’s on so many people’s minds that nowadays even the guy I buy chuan’r from knows the word “PM 2.5.” HEPAs do an amazing job at removing particulates, but particulates aren’t everything. Gases like volatile organic compounds (VOCs) are so small that they slip through HEPAs. “VOC” […]