Just thought I'd share some info. Shortly before I attended the National Aspergillosis Centre at Wythenshawe I posted a question regarding the benefits of air purifiers and received some helpful info. I then attended Wythenshawe and the medical intervention I received greatly improved my health so never actually got round to purchasing one. However I also have COPD (emphysema/asthma) and obviously there is a gradual decline in health for this condition. I re-visited the idea of purchasing one and (touch wood) the results are very promising. I will have to keep an eye on things that this improvement continues but it is looking good. Certain criteria have been met with the air purifier:- a true HEPA filter which filters out ver small particles; a carbon filter; filter change indicator; automatic or manual mode etc. my health has improved dramatically. Fingers crossed it continues. Once we have reached this stage in our health we are usually desperate to try most things. However I would have a problem with some things (although undoubtedly they would work for some people). As I am considerably underweight I would have a problem with any diet which restricts certain foods (except under medical supervision); I would also have a problem using natural herbal remedies (I do feel that 'natural' does not equate with 'safe'. However an air purifier could only benefit and would cause no harm - and may even benefit the whole family. Hope my improvement continues.