Federal regulators have concluded a massive six-year review of a chemical found in everyday items like car tires and adhesives, determining that while the general public faces no significant threat, workers on the front lines of manufacturing are at risk of serious health complications, including cancer.
The U.S. Environmental Protection Agency (EPA) announced the completion of its risk evaluation for 1,3-butadiene this week, meeting a court-ordered deadline under the Toxic Substances Control Act (TSCA). The findings draw a sharp line between industrial exposure and consumer safety.
According to the agency’s “gold standard” scientific review, the colorless gas presents “unreasonable health risks” to employees in 11 specific industrial settings. The evaluation linked high levels of workplace exposure to severe outcomes, including reduced birth weight in pregnancies, anemia, leukemia, and bladder cancer.
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However, the agency emphasized that these dangers do not extend to the average American household or even those living near industrial plants.
“EPA did not find unreasonable risks to the environment, for consumers and to the general population including people living near facilities,” the agency stated. Consumer products generally contain the chemical at trace levels of less than 0.001 percent, which the EPA deems safe.
A “More Accurate” Look at Risk
The evaluation process, which scrutinized approximately 20,000 scientific studies and 30 different use cases, utilized updated methodology to pinpoint where the dangers truly lie.
Regulators noted a shift away from conservative default assumptions to real-world data. By moving to the National Emissions Inventory (NEI) database, the EPA was able to analyze facility-specific conditions—such as smokestack heights, emission angles, and exact geographic coordinates—rather than relying on broader, less precise data.
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This granular approach allowed for a more realistic assessment of exposure risks for communities surrounding these facilities, ultimately clearing them of unreasonable risk designations. Conversely, peer reviewers pushed the agency to combine risk estimates for bladder cancer and leukemia, which resulted in a higher overall cancer risk calculation for industrial workers.
Next Steps: New Rules for Industry
With the risk evaluation finalized, the EPA is legally required to move into the rulemaking phase. The agency says it will now develop safeguards specifically designed to protect workers in the identified high-risk sectors.
The upcoming regulations will consider factors such as the economic impact of restrictions, the benefits of the chemical’s use, and the practical implementation of safety measures, such as Personal Protective Equipment (PPE).
“Our safeguards will be tough and practical,” the agency noted in its announcement, promising “regulatory certainty” for companies while prioritizing worker health.
1,3-butadiene is a critical component in the manufacturing of synthetic rubber and plastics, heavily used in the automotive industry for tires, sealants, and coatings. The EPA has committed to extensive stakeholder engagement as it drafts the new rules to manage the identified occupational risks.
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