If you wish pure certified therapeutic grade essential oils, then step into my office.  For a great benefit diffusing essential oils into the air with a cool-air diffuser is one of the best ways to enjoy both their aroma and their naturally therapeutic properties.  My pet and I both enjoyed the healing affects of these oils after our surgeries.  We healed faster and slept better.  I use these powerful oils with my clients, myself, whether in office or at home.  If for use in your car, place some of the oils on a cotton ball in place next to your air vents.  So delicious.