Episode Details

Hamilton residents’ long-standing suspicion is confirmed: black soot falling from the sky contains toxic coal-burning chemicals, according to new research from McMaster University. Volunteers collected samples across the city, revealing higher levels of harmful PAHs near industrial zones — contradicting past government claims that the grime was mostly road dust. Led by a professor who lives in the affected area, the “What’s the Grime?” study traces the problem back to the 1950s and aims to empower the community with science-backed evidence. With a peer-reviewed manuscript underway and a public meeting scheduled for August 20th, researchers plan to expand the study, test more compounds, and even explore cleaning solutions — turning lived experience into actionable data.

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