Buried in the history of everyday building materials is a grim chapter: by the 1980s four workers at a PVC production factory in Louisville, Kentucky were diagnosed with and died from angiosarcoma of the liver — a rare, aggressive cancer later associated with vinyl production chemicals. That cluster of deaths forced the vinyl industry and regulators to confront occupational exposure in a way they had not before. The industry response was to establish an apparently clear numerical limit — one part per million (1 ppm) — as the acceptable exposure level for certain vinyl production processes, and to remove PVC from consumer products such as hairsprays that had contributed to wider public exposure. The episode stands as a classic industrial tragedy where a string of deaths moved an entire sector from complacency to damage control, even as debate remained over who exactly was at risk and whether the new standards were protective enough.
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