Loud sounds and noises can damage your hearing. The level of the sound, length of time you are exposed, how often you are exposed, and individual factors of susceptibility impact your risk. Sound levels are measured in decibels, dB for short. The higher the decibel level, the louder the sound.
How long and at what volume can you listen before your ears are at risk?
The National Institute for Occupational Safety and Health (NIOSH) have suggested a damage-risk criteria as a basis for recommending noise exposure limits based on noise level and exposure time. NIOSH recommends an exposure limit of 85 dBA for 8 hours per day, and uses a 3 dB exchange rate (for every 3 dB decrease in noise level, the allowable exposure time is doubled). NIOSH recommendations are based on occupational noise exposure. NIOSH recommendations have been shown to protect 92% of the population. (Resource: https://www.etymotic.com)
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