06/17/2026
Ever wonder why propane has that distinctive βrotten eggβ smell? Propane is actually odorless. A harmless odorant called ethyl mercaptan is added to make leaks easy to detect. Itβs so potent that the human nose can detect it in concentrations as small as one part per billion. That unmistakable smell serves as an early warning system, helping keep homes and families safe. If you ever smell propane, leave the area immediately and contact your propane provider.