👉 The signature fumes of a chemical leak, such as those from industrial processes or hazardous materials, typically include a distinct mix of volatile organic compounds (VOCs) like benzene, toluene, and formaldehyde, which can manifest as a pungent, often acrid odor. These fumes may also contain sulfurous compounds, giving them a metallic or rotten egg-like scent. In some cases, especially with more toxic substances, the smell can be more complex, including ammonia or hydrogen sulfide, which have strong, unpleasant odors. The specific composition of these fumes depends on the chemicals involved and their concentrations, but they generally serve as an early warning sign of a potential hazard.