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My wife is running a fan right next to the bed every night and also claims she needs to have this air movement. But I'm wondering (and researching) whether this might not be making things worse. If you look at the blades and wire cage on a typical fan (or the blades on a ceiling fan), they are caked with dust. Any air movement from a fan is actually blowing around an awful lot of dust that ordinarily would settle on furniture or remain suspended in air but not moving around much. I like air movement at all times too (not an asthmatic), so I'm trying to find out if that's really a good thing for asthma, or is it something that just "feels good" and therefore merely gives the illusion of being beneficial. My wife also claims that cold air from an open window (it's winter here now, so around 0C to -7C when she opens a window) "feels good" and also likes to sit outside on the balcony in these temperatures. But she doesn't like a cold drink, with or without ice cubes, as this causes her to start coughing. So I have to wonder if the air movement and cold air is simply a feeling of getting "fresh air" to someone with asthma, whereas from what I've read, it's warm, humid air that is said to be beneficial for people with asthma, air around a swimming pool for example.