What smell is commonly associated with hydrogen sulfide?

The common smell associated with hydrogen sulfide is that of rotten eggs. This distinct odor is a key characteristic of hydrogen sulfide and is used as an indicator of its presence, particularly in environments such as sewage systems, industrial sites, and certain geological formations. Recognizing this smell is crucial for safety, as hydrogen sulfide is a toxic and potentially lethal gas when inhaled in significant concentrations. Awareness of its distinct rotten egg scent can prompt individuals to evacuate an area or take necessary precautions to avoid exposure, thus highlighting its importance in safety protocols and emergency responses.