What is the characteristic smell associated with hydrogen sulphide?

The characteristic smell associated with hydrogen sulphide is often described as that of foul or rotten eggs. This distinct odor is due to the presence of sulfur in the compound, which is known for releasing strong and unpleasant scents. Many people can detect this smell even at very low concentrations, making it a critical warning signal in environments where hydrogen sulphide may be present, such as sewage treatment facilities or oil and gas operations.

Understanding the smell is crucial for safety, as hydrogen sulphide is a highly toxic gas, and being able to recognize it can help in taking immediate precautions to avoid exposure. Other smells listed do not accurately reflect the nature of hydrogen sulphide, further emphasizing the uniqueness of its foul odor.