![](https://i.cbc.ca/1.5955494.1713377537!/fileImage/httpImage/image.jpg_gen/derivatives/16x9_620/sign-for-aamjiwnaang-resource-centre-in-southwestern-ontario.jpg)
After Aamjiwnaang First Nation in Sarnia, Ont., sent home its own employees who were feeling sick, it called on governments to shut down a facility that data indicates has been emitting high levels of a chemical in the air, in an area known for its many industrial plants.