When US regulators issued a 2019 assessment of the widely used farm chemical paraquat, they determined that even though multiple scientific studies linked the chemical to Parkinson’s disease, that work was outweighed by other studies that did not find such links.
The Environmental Protection Agency (EPA) reiterated its assessment in a 2021 report, determining that when weighing all the risks and benefits, US farmers could continue to apply the weedkiller across millions of US acres to help in the production of soybeans, corn, cotton and an array of other crops.
