EPA Advances Ethylene Dibromide Risk Assessment, Seeks Public Feedback
Reference source : US EPA
The U.S. Environmental Protection Agency (EPA) has released a draft risk evaluation for ethylene dibromide (CAS No. 106-93-4) and is seeking public feedback as part of its ongoing review under the Toxic Substances Control Act (TSCA). The assessment aims to determine whether the chemical poses an unreasonable risk to human health or the environment under its current conditions of use.
Chemical Remains Widely Used in Aviation Fuel
Ethylene dibromide is a colorless, sweet-smelling volatile chemical primarily used in fuels and related products, including as a lead scavenger in leaded aviation gasoline (avgas) to prevent engine fouling. Exposure can occur during the production, handling, transportation, and use of aviation fuel products. Workers involved in manufacturing and refueling operations are among those most likely to come into contact with the substance. Consumers, such as small aircraft operators, may also be exposed during refueling activities.
EPA Finds Preliminary Evidence of Unreasonable Risk
According to the draft evaluation, EPA's preliminary findings indicate that ethylene dibromide may pose unreasonable risks to human health under certain conditions of use. The agency conducted its assessment using available scientific evidence and examined a range of potential impacts, including acute and chronic health effects, cancer risks, occupational exposures, and environmental consequences.
The review assessed risks to workers, occupational non-users, consumers, nearby communities, and sensitive populations who may face elevated exposure. Environmental risks to aquatic and terrestrial species were also evaluated.
Public Input to Shape Final Decision
EPA is inviting comments from industry groups, researchers, environmental organizations, and members of the public until October 19, 2026. The agency is particularly interested in receiving additional data on workplace exposure, operational practices, engineering controls, monitoring information, and the use of protective equipment, in order to strengthen the final evaluation.
Next Regulatory Steps
Following the public comment period and peer review by the Scientific Advisory Committee on Chemicals, EPA will finalize the risk evaluation. The final findings will determine whether further regulatory measures are needed to manage the risks associated with the use of ethylene dibromide in the United States.