A former stoneworker named Lopez sat confined to his East Bay home, breathing with the help of a whirring oxygen supply machine through clear tubes pronged to his nostrils. After years of making kitchen countertops from engineered stone, the 43-year-old was diagnosed with silicosis , an often deadly lung disease linked to inhaling toxic dust the material releases when powercut.

The once-active father of four now awaits a double lung transplant. He can no longer support his family or walk a few steps without pausing to catch his breath. Two stonecutter friends died after working with the man-made material, also known as artificial stone or quartz. Three others are on a waitlist for lung transplants, he said.

“I feel desperate just sitting here unable to do anything,” said Lopez, an un

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