In its natural state propane is an odorless, colorless gas, but ethyl mercapatin is added in order to make propane leaks easier to detect. With the ethyl mercapatin added propane smells like rotten eggs, a skunk’s spray or a dead animal.
Contact the Propane Education and Research Council (link below) to have a “Propane Users Safety Guide” mailed to you, and share this information with everyone in your household.