He was concerned that of the 24 white noise machines and 6 phone apps reviewed in his study, all of them "had levels that were higher than are permissible for an eight-hour shift by NIOSH." ...

Loud noise and your ears Premium. Published - December 01, 2024 06:00 am IST . D. Balasubramanian. ... This ‘sound’ is a sign of anomalous electrical activity from damaged hair cells.