May 1, 2026This pesticide is so toxic it’s been banned in over 70 countries. But plants in the South are releasing it into the air.

Wayne County, Mississippi, in a quiet southeast corner of the state, is home to about 20,000 people surrounded by forest and farmland. But Wayne distinguishes itself in two ways: it is home to a Sipcam Agro plant that processes the toxic herbicide paraquat. Within the U.S., the plant is the largest single emitter of paraquat. Wayne County also sees high rates of Parkinson’s disease deaths, in the top 7% of all U.S. counties that reported Parkinson’s deaths between 2018 and 2024. Troves of evidence have long linked paraquat to Parkinson’s, the world’s fastest-growing – and incurable – neurodegenerative disease. In March, Syngenta announced it would stop producing paraquat. But Syngenta’s exit doesn’t mean paraquat will stop entering the U.S. Instead, other companies and other facilities – like the one in Wayne County – will fill the gap, likely increasing the amount of paraquat they handle.