Two educators and about a dozen students, approximately ages 8 to 12, hold their hands over the ears as if the room is very loud. A slide from the Noisy Planet Teacher Toolkit is visible on a large screen behind the group.

The Noisy Planet campaign celebrates 10 years of teaching kids and adults about healthy hearing habits.

Decibel measurement gauge with green needle pointing to 30 dB

Many factors influence how loud a sound seems. One easily measured factor is sound intensity, or volume, which is measured in decibels. A-weighted decibels, or “dBA,” are often used to describe sound level recommendations for healthy listening.

A model of the mouse inner ear. The Y-shaped structures are lying horizontally in this model. The long part of each Y shape appears in light blue. At the top of the Y shapes are outer hair cells (these appear in a variety of colors) and two other branches called Dieters' cells and phalangeal processes (these appear in aqua and blue-purple).

Scientists have been studying how to regrow damaged hair cells to restore hearing. Replacing hair cells might not be enough—to function properly, new hair cells also need to be organized in a specific way.

Three teenagers sitting on the ground laughing and talking with each other.

Research published in 2017 found that the percentage of U.S. children and teens with signs of possible noise-induced hearing loss did not change significantly from 1988 to 2010.

A woman patient talking to a woman doctor using a tablet

Scientists have found new clues to explain how a common chemotherapy drug, cisplatin, causes permanent hearing loss in many adults and children.

Parents and children

Noisy Planet’s Spanish-language website raises awareness about the causes and prevention of noise-induced hearing loss. 

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