California workers died of a preventable disease. The threat was known years earlier

Yet the threat of silicosis is far from a new one, known for centuries as a hazard to workers breathing in tiny particles of crystalline silica.

It still astounds me as to how glacial the pace has been" to tackle the problem, said Dr. Ryan Hoy.

Regulators should be looking at stronger regulations to protect workers from silica dust exposure.

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