> Do they make a difference? Perhaps a placebo? A must have? It really depends on where you're coming from. I have one of those air purifiers from Ikea (Förnu

> Do they make a difference? Perhaps a placebo? A must have? It really depends on where you're coming from. I have one of those air purifiers from Ikea (Förnuftig). It's cheap but not the cheapest. On any high dust/polen concentration level day, a minute or so with the device turned on at full blast is enough to make any problem go away in that particular room.