What is the characteristic odor associated with hydrogen sulfide gas?

The characteristic odor associated with hydrogen sulfide gas is often described as resembling the smell of rotten eggs. This recognition comes from the specific sulfur compounds that give off this distinctive scent at low concentrations, making it easily identifiable. When hydrogen sulfide is present, even in small amounts, the odor can be quite strong and unpleasant, which is important for safety awareness in environments where the gas may accumulate, such as in wastewater treatment facilities.

This distinguishing odor serves as an important alert to the presence of the gas, which can be hazardous in higher concentrations. The awareness of this smell can help workers take necessary precautions to avoid exposure and ensure safety in their work environment.