Air freshener for the cabin filter

I wonder what kind of allergens and irritants are in air freshener. A squirt of Floris 89 on a hanky which I place under the passenger seat, works if I had a smelly coworker or "passenger" in my vehicle.
 
My wife is an essential oil expert.
We put several drops of different oils on the new filter element at change time. The oils are natural-not syntheticly derived toxins.
 
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