What does hydrogen sulfide smell like at high concentrations?

Hydrogen sulfide has a distinct odor characteristic that can be easily recognized. At high concentrations, it predominantly emits a smell reminiscent of rotten eggs. This is due to the presence of sulfur in its chemical structure, which contributes to the pungent odor often associated with decaying organic matter. The strong and unpleasant scent serves as a warning sign of its toxicity, making it crucial for individuals working in environments where hydrogen sulfide may be present, such as sewage treatment facilities or oil refineries, to be aware of this smell. This characteristic allows for immediate recognition of potential danger before exposure to hazardous levels.