The study, by researchers at the University of Colorado at Boulder and Children's Hospital in Boston, indicates a typical person can safely listen to an iPod for 4.6 hours per day at 70 percent volume using stock earphones, according to Cory Portnuff, a doctoral researcher in CU-Boulder's speech language and hearing sciences department.
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News : New study provides guidelines for safe levels of iPod listening - 1 views
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The researchers found that listening to music at full volume through an iPod for more than five minutes a day using stock earphones can increase the risk of hearing loss in a typical person
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Typical individuals can tolerate about two hours a day of a decibel unit known as 91-dBA before risking hearing loss, Portnuff said. The term dBA stands for "A-weighted decibels, a scale that takes into account that the human ear has different sensitivities to different frequency levels,"
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EPA to clean up Carter Carburetor site - St. Louis American: - 0 views
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The EPA will remove PCBs and TCE from subsurface soils and remove PCBs in two on-site buildings.
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“This clean-up is absolutely critical because so many children are potentially at- risk across the street at the Herbert Hoover Boys & Girls Club,” said U.S. Rep. Wm. Lacy Clay (D-MO).
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the agency plans a thermally enhanced extraction of two toxins: trichloroethylene (TCE), a chlorinated industrial solvent, and polychlorinated biphenyls (PCBs), a cancer-causing chemical once used in electrical transformers that were disassembled at a building on the site.
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