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They are an almost inevitable feature of any upmarket kitchen, but the glamour and durability afforded by quartz countertops come at a heavy cost. We’re not talking about their often eye-watering price tags, but about the deadly toll they’re taking on the workers who make them. A new study, conducted by the University of California – San Francisco (UCSF), has concluded that these craftspeople are dying of lung disease at a young age as a result of their work. “Every day I hope that the phone rings telling me to come to the hospital to get my new lungs,” former countertop maker Leobardo Segura-Meza said in a press release for the medical report, which was published in JAMA Internal Medicine on Monday. Sign up for our free Indy100 weekly newsletter Segura-Meza, 27, first took a job as a stone worker in LA when he was just 17. He explained that he would always wear a mask and use dust-reducing tools when he cut and ground the slabs. And yet, in February 2022, he suffered from such severe shortness of breath that he was forced to go to A&E. A lung biopsy revealed that he had silicosis and he has been on an oxygen tank ever since. He’s now no longer able to financially support his wife and children and, although he’s been approved for a lung transplant, he fears he’ll run out of time. Two fellow stone workers died while they were on the waiting list, the press release points out. So why is quartz so bad? How many people have died so far? And what’s being done about it? What exactly is quartz and why is it particularly dangerous? Quartz is the most abundant mineral in the Earth's crust and is made up of silicon and oxygen. It is resistant to chemical and physical weathering, which makes it ideal for use in kitchen worktops. “Quartz” countertops aren’t made of pure quartz, however. They consist of an artificial material made up of pieces of natural quartz bonded together with adhesive, resins and, often, glass. They are popular, not only because they are robust and easy to clean, but because natural quartz can be found in a variety of colours and can also be easily dyed. The danger associated with quartz comes from the tiny particles of toxic dust that are released when it is cut, ground and polished. Over time, exposure to this dust can lead to a disease called silicosis. Particles from this engineered stone are far more dangerous than from its all-natural counterparts because of its high concentration of silica and the polymer resins and dyes that are added to it. The risk of silicosis from artificial stone was first identified in Israel in 2012, and the first US case was identified in Texas in 2015. Since then, California has become an epicentre of the disease, which used to be known among coal miners as “black lung”. What is silicosis? Silicosis is a lung disease caused by breathing in tiny bits of silica. Over time, exposure to silica particles causes inflammation which, over time, can lead to permanent lung scarring. This, in turn, makes breathing difficult. Complications from silicosis can include tuberculosis, lung cancer, chronic bronchitis, autoimmune disorders and kidney disease, the American Lung Association warns. Approximately 2.3 million US workers are exposed to silica because of their jobs, including 2 million in construction and 300,000 in other industries, according to the health organisation. How many people have died after working on quartz countertops? Researchers at UCSF and UCLA collaborated with public health officials to identify 52 stone workers in the state who had recently been diagnosed with silicosis. Of these, 51 were Latino immigrants – like Segura-Meza – and most were diagnosed between 2019 and 2022. For 20 of the patients, the disease had already reached an advanced stage at the time of their diagnosis, and have now 10 died. Their median age was 45, with an average work history of 15 years, according to the report. “Increasing case counts of silicosis among stone fabricators over the last 10 years and accelerated progression of disease transforms the paradigm of an all-but-previously-forgotten disease in the US,” said Jane Fazio, a co-author of the UCSF study. “Our study demonstrates severe morbidity and mortality among a particularly vulnerable group of young underinsured and likely undocumented Latino immigrant workers.” What’s being done about all this? The study’s authors are calling for the implementation of new measures to protect workers from exposure to silica dust and help ensure early diagnosis of silicosis. There is also some discussion of a potential ban of high-silica products. “Our paper raises the alarm,” said Sheiphali Gandhi, a UCSF pulmonologist and co-author of the study. “If we don't stop it now, we're going to have hundreds if not thousands of more cases. Even if we stopped it now, we're going to be seeing these cases for the next decade because it takes years to develop.” No country has yet banned quartz-based materials, but Australia has considered it and is developing new regulations to help reduce the risk of silicosis, the press release for the study notes. In California, the Los Angeles County Board of Supervisors is reportedly weighing up a potential ban, and the state’s Division of Occupational Safety and Health has begun drafting emergency rules. However, among the challenges faced by affected workers are a lack of access to health care and the need to support their families. Of the patients included in the study, 45 per cent continued working after their diagnosis. Furthermore, demand for quartz surfaces is booming. According to one research report, the market for quartz countertops will grow to $13 billion (more than £10 billion) by 2027. All this leads us to believe that the problem isn't going away any time soon. 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