They call this science, with a study of 2? No controls, and certainly no comparison to all the other pollutants that we breathe everyday. Did not see mention say of the the eucalyptus oils that are released into the air naturally in environments where they are naturally occuring such as the Blue Mountains in Australia? (whose name comes from the colour the air gets from the trees releasing all the oils).  What about all the air fresheners that the big companies want us all to buy, most of them are actually made with synthetic aroma chemicals and essential oils, so wonder what they release. Aromatherapy has been around for years, and I don't think anything has been proven that can actually link these to harmful ailments when used in MODERATION and appropriately. The issue is that many in the general public think that if a little is good, a lot must be better. I have been using Elanveda aromatherapy products and they have actually helped me get better. Let's have a more defined study before we condem something that might actually help people.