An August 2016 study by Université du Littoral Côte d'Opale and Lebanese University found, “the first evidence that natural essential oil components counteract the inflammatory effects of particulate matter, such as that contained in polluted air."
Phenylpropanoids
trans-anethole from anise and fennel
estragole from basil
eugenol from clove bud oil
isoeugenol from ylang ylang