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Loud sounds can stress and potentially damage delicate hair cells in the inner ear that convert mechanical vibrations, or sound, to electrical signals that the brain interprets as sound. "Over time, the hair cells can become permanently damaged and no longer work

No one set of earphones is more dangerous than another," he said. "While isolator style earphones are capable of producing higher levels of sound than earbuds, most people use them at a lower volume than earbuds because they block out background noise. It's important to monitor the level of volume control settings."

The citizen advocacy group is calling for cleanup goals be expanded to cover all areas impacted by Carter Carburetor, the treatment technology to be proven to work on PCBs on similar sites and at similar concentrations before use at the St. Louis site, the risk assessment scenario expanded to include children of all ages and the cleanup plan protect the health of children and area residents.