Is your air conditioner bringing in dirty outside air? Here’s a live test with a particle counter. See the average results over multiple AC tests here.
A question that I get asked often (and that I have always wondered about) is whether my wall-mounted air conditioner is bringing in dirty air from outside. If so, it’d be safer not to use it, especially on really bad days. My short answer is no. To explain why, I’ve got three points of evidence: […]
I recently did some research on whether indoor air is as bad as outdoor air. Before that, I had a conversation with a friend 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? […]
laundrylist 提问: What is the energy usage associated with running a cheap box fan for eight hours at night versus the two expensive models that you compared your cheaper model to? Excellent question! I’ve wondered about that myself. The fan is 50 Watts, compared to 27-215 for an IQ Air (depending on fan speed). So […]
Adam in Suzhou sent me a picture of a creative solution to a filter problem. The fan he had at his house had an opening that was slightly larger than the HEPA. So Adam cut out a piece of cardboard to close up the edges. Great idea! Adam says, “It’s already turned slightly gray after […]
passport4adragon 提问: Hi, I’m in Shanghai and recently put together your DIY purifier and bought the same fan and filter you suggested – I think it’s working! A couple of questions – 1. I bought the exact same filter you did on Taobao – how often should it be replaced if I run the purifier […]
Dr. Saint Cyr recently pointed me to great tests of air purifiers from the Shanghai Consumer Protection Bureau: The reason this type of research is so badly needed is that Western research (like this report from Consumer Reports) focuses on allergens, not general industrial air pollution. Allergens are probably more relevant for most Americans, but […]
Science in the news! The word on clean air seems to be getting out. Particle Counting was written up in a few places recently: James Fallows graciously wrote about Particle Counting as one low-cost safeguard while living in “toxic” China, partly in response to New York Times Beijing correspondent Edward Wong’s personal account of worries […]