Another possible threat for miners: diesel exhaust
Some years ago, salt miner Curtis Layman went to the doctor for a checkup prior to a hernia operation. The exam revealed that Layman's lungs were in terrible shape, prompting the doctor to deliver a stern warning: Quit smoking.
Layman explained that he didn't smoke. He had, however, worked for decades at the Morton Salt mine in Fairport, Ohio, inhaling exhaust from diesel-powered machines. "They said my lungs were black," says the 66-year-old Layman, now retired. "It kin
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