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The U.S. Environmental Protection Agency (EPA) announced on January 5, 2026, the availability of the final risk evaluation under the Toxic Substances Control Act (TSCA) for 1,3-butadiene. 91 Fed. Reg. 264. EPA states in its December 31, 2025, press release that it found “potential unreasonable health risks for workers who breathe in this chemical at their jobs in 11 specific industrial settings.” As required by TSCA, EPA will now develop a risk management rule to protect workers from the...

On September 23, 2025, the U.S. Environmental Protection Agency (EPA) proposed highly anticipated amendments to the procedural framework rule for conducting existing chemical risk evaluations under the Toxic Substances Control Act (TSCA). 90 Fed. Reg. 45690. When conducting an existing chemical risk evaluation under TSCA, EPA must determine whether a chemical substance presents an unreasonable risk of injury to health or the environment, without considering costs or nonrisk factors, including...