Viartis is a UK-based group of independent, self-funded medical researchers specializing in Parkinson’s Disease. They have compiled a list of toxic elements that may cause or partially cause PD. The list includes plants and flowers like Annonaceae; chemical elements like Carbon Disulfide, copper, and cyanide; pesticides like Dieldrin; organic compounds like Hydrocarbons and industrial chemicals like N-Hexane. Each toxic element is given a brief description and a list of where you might be exposed to the dangerous element. It includes mention of consumer products that may contain the chemicals and where they come from. High exposure to these toxic substances has been found to increase the chances of developing PD.
Source: Toxic Causes of PD