Comment by seanmcdirmid

Are you sure? We had one of the bigger Blue Airs (605) in Beijing and I didn’t like using it at all. When it was a 150-200 day, I would just run it before sleep with the windows closed. On worse days, we ran it all night, but it was loud and made the air smell like ozone, giving me a headache. I’m so glad I live in the Seattle area now and can open the window at night.