Study Links Industrial Chemical Trichloroethylene to Increased Parkinson’s Disease Risk Nationwide Study Finds Dose-Dependent Link Between TCE Exposure and Parkinson’s A large nationwide study published in October 2025 found long-term outdoor exposure to the industrial solvent trichloroethylene (TCE) is associated with an increased risk of Parkinson’s disease. [1] Researchers at the Barrow Neurological Institute analyzed data from 221,789 people newly diagnosed with Parkinson’s and more than 1.1 million matched controls, all of whom were Medicare beneficiaries aged 67 and older. [2] The study mapped each person’s residential exposure to TCE and identified a clear, dose-dependent pattern, according to the findings. Higher ambient TCE…

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