Eucalyptus aromatherapy air freshener, 100% Pure and All-Natural Eucalyptus Globulus 80/82 Essential Oil. The Fragrance of Fresh picked Eucalyptus Leaves. Just Add Water to Refresh. Dunhams Essentials - Dunhams Home. Eucalyptus oil is highly effective for treating a number of respiratory problems including cold, cough, runny nose, sore throat, asthma, nasal congestion, bronchitis and sinusitis.