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Double hearing protection is needed in work environments with noises that exceed 100 decibels on average over an eight-hour shift. Workers can wear ear plugs underneath their protective earmuffs to stay safe in these situations. They should also test the noise level regularly to find out if this equipment is necessary based on the exposure level. Occupational hearing loss remains a persistent problem in work zones across the U.S. Many machines and industrial processes create loud noises …