EPA gathers input on risks of Parkinson’s-linked weed killer

By Marc Heller | 06/30/2026 01:24 PM EDT

The agency plans to convene scientists and policy groups to discuss growing evidence of the farm chemical paraquat’s health risks.

EPA headquarters in Washington. Flags fly on the building.

EPA headquarters on March 16, 2017, in Washington. Justin Sullivan/Getty Images

EPA said it will convene a discussion this summer on the weed killer paraquat, inviting scientists and policy groups to debate the future use of the farm chemical tied to Parkinson’s disease.

In a news release, the agency said it’s calling the “roundtable” meeting in light of updated information suggesting paraquat may escape into the air more readily than earlier believed, posing potentially greater human health risks to anyone who inhales it.

EPA Administrator Lee Zeldin said in a statement that the agency is committed to “radical transparency” as well as to supporting the science behind pesticide safety.

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“When new science raises questions, we will not look the other way,” Zeldin said, adding that EPA requires manufacturers to prove that their products are safe in real-world conditions.

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