doTERRA Air-X Essential Oil Blend 15ml EXP 4/23 SEALED Air-X Air Blend combines CPTG Certified Pure Tested Grade® Litsea, Tangerine, Grapefruit, Frankincense, and Cardamom essential oils. Its intense citrusy, woody, and herbal aroma helps freshen the air when diffused. Early research suggests limonene—a major chemical component of several essential oils found in Air-X oil blend—may provide cleansing benefits.