Have you asked about this to any of the Yahoo groups that deal with MCS? If you need the URLs, I can get them for you. There has not been much activity on here lately. Personally, I have not had success with any personal air filters/purifiers, but there is a lady who is able to work at a store in a nearby town IF she wears hers around her neck. I can call up there tomorrow to get the make/model of the one she uses. We are all so different in what and how much we can tolerate of all those chemicals in the environment. I have to use a nose clip AND a carbon-filtered mask for going out anywhere. How long have you had MCS?