The clearest evidence around the risk of TCE is around workers who are exposed to the chemical in the work-place.

1. A 2008 peer-reviewed study in the Annals of Neurology, for example, found that TCE is “a risk factor for parkinsonism.”
2. And a 2011 study echoed those results, finding “a six-fold increase in the risk of developing Parkinson’s in individuals exposed in the workplace to trichloroethylene (TCE).”

Most cases of Parkinson’s disease are considered idiopathic, i.e. they lack a clear cause. Yet researchers increasingly believe that one factor is environmental exposure to trichloroethylene (TCE).

It's a chemical compound used in industrial degreasing, dry-cleaning