I live in Beijing and we use the air purifiers from Xiaomi to measure indoor air quality (and clean it up). It's true that eg frying bacon really makes the air quality index spike up a lot.
Off topic but I have a ton of questions about air in Beijing - I can hardly believe what I've heard. It's kind of off-topic but if you'd have a minute, could you shoot me an email (see my profile here) or reply with yours? Thanks.
