Thanks everyone for your thoughts. I was hoping someone in the forum had experience with a "personal" air purifier that you wear around your neck – like AirTamer's – whether they were effective for protecting one's health or caused lung problems and/or what your doctors had to say about it. A health environmental consultant we are working with felt that AirTamer's ozone emission (4 parts per billion which is 10 times lower than the EPA’s recommended 50 parts per billion limit on ozone for electronic equipment and FDA's limit for medical devices) would quickly breakdown due to its instability and should not be a health threat. However, it sounds like any purifier that is a negative ionizer is a 'no no' due to ozone emission (however small). Disappointing because I thought it might be an effective way to try to venture out of my house or go to someone else's house and still have protection (along with wearing a mask).