Chimneys of the Horne foundry complex rise next to the Notre-Dame neighborhood in Rouyn-Noranda, Que., a city of 40,000 people. A 2019 study found that children at Notre-Dame had higher than average levels of arsenic in their bodies.


Ethan Valois is now eight and the arsenic levels in his body have started to drop.

He and his parents live in Rouyn-Noranda, Que., home of a copper smelter that produces the known carcinogen in amounts of about 30…



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