I was on the phone to my aunty yesterday and she said her friend has had bad asthma all her life and swears by ionisers in her bedroom/living etc. Basically it can just be plugged into a socket and clears allergens/smoke out of air. Not really sure if there is a difference between dehumidifiers and ionisers....
I don't want to waste my money if they aren't effective and I realise everyone will probably have diff experiences of them but I do have allergies to dust/cat and smoke sets me off too so wondering if its worth investing for one to put in my bedroom at uni